Alison DiLaurentis (Sasha Pieterse) may only be a recurring character on Pretty Little Liars, but she might just have the best scenes of anyone. Whether flashback, hallucination, or present-day, Ali always manages to make an impression, revealing new nuances to her both own personality and that of the Liars's.

Here are seven of our very  favorite Ali moments.

Ali Tries to Convince Aria to Tell her Mom About Byron’s Affair

The first few times we saw Ali in flashback form, she didn’t exactly come off as the world’s greatest friend. Then, in Season 1, Episode 4: “Can You Hear Me Now,” we watch Aria remember a conversation she had with Ali right after they saw Byron making out with someone who wasn’t Aria’s mom. Ali encourages Aria to tell her mother what she saw, telling her, “You can’t do that to your mom” (i.e. keep this from her). Though later we see Ali blackmailing Byron to keep his secret, in this moment, Ali seems to really want what’s best for Aria and her family.

Ali Muses About Immortality

If there’s one thing Ali has in spades, it’s charisma. We can see why the Liars were drawn to her, despite her myriad shortcomings as a friend. In Season 1, Episode 8: “Please, Do Talk About Me When I’m Gone,” Ali muses about how “deliciously tragic” it would be to die young and beautiful. When the others chastise her for her gruesomeness, Ali replies: “It’s not gruesome. It’s immortality, my darlings.” Ali had that enigmatic charisma thing down to a tee.

Ali as a Candy Striper

Ali made her first real post-death appearance in Season 1, Episode 11: “Moments Later” when Hanna is recovering in the hospital after being hit by a car. Ali shows up in a candy striper outfit (or so Hanna hallucinates?) to check on her ailing friend with some of the best lines ever. “They said you were dead,” mumbles a drugged-up Hanna. Ali, unimpressed, replies: “Yeah, I heard that, too.” Though Hanna doesn't get much out of her elusive and maybe-dead best friend, Ali tells her, “You think the truth it some big, shiny disco ball of purity? … You’re always better with a really good lie.” And Ali demonstrates her love for her bestie, saying, “I was so scared you were going to die. I had to come back. I didn’t care how dangerous it was. I had to see you.” In that moment, Ali just seems like a scared teenager, before switching back to omniscient teenager mode with this parting shot: “You know, I really should do something about ‘A.’ That bitch is genuinely getting on my nerves.” Awesome.

Ali Drags Emily From the Barn

In Season 2, Episode 12: “Over My Dead Body,” Emily almost dies when she is trapped inside of a barn filling with carbon monoxide. She passes out, and Ali drags her to safety. “It’s okay. You’re with me now,” Ali soothes a confused Em, telling her that she was always her favorite because “nobody loved me as much as you did.” Then, she gives Emily a choice: stay there or go with her. Emily closes her eyes, and Ali gives her a kiss and when Emily wakes up again Ali is gone. At the time, we thought Em might just be hallucinating, but now that it seems like Ali might be alive, this scene might be only more awesome. She saves her friend from certain death, gives her a kiss, and then disappears into the night. Epic.

Ali Pretends to Be Vivian Darkbloom

While some teenage girls spend their free moments shopping, playing sports, or taking a class at the local college, Ali likes to troll around nearby towns as her alias, Vivian Darkbloom. In Season 2, Episode 18: “A Kiss Before Dying,” Hanna runs into Ali as her brunette alias at the hair salon. She tells Hanna: “Here’s the thing: I’m pretending to be someone else, so play along … Cause I’m bored. I do it a lot. You should try it sometime. I mean, aren’t you just sick and tired of being you?” The best thing about this situation is that Hanna tells the other Liars that she never mentioned the occurrence because it seemed like “typical Ali weirdness” at the time.

Ali Plans a Dream French Vacation

In Season 3, Episode 18: “Dead to Me,” Emily remembers a sweet, quiet moment she shared with Ali before she disappeared. They were studying French in the school after the day had ended well, Em was studying, while Ali planned their dream vacation to France, complete with “dancing through sunflower fields” and “lounging around in our bikinis in the French Riviera.” Emily asks Ali how long they will be away for.  “How 'bout forever?” Ali responds. This moment manages to be both bittersweet and ominous at the same time, and shows us the best possible side of Ali.

Ali Dances With Spencer

Alison’s friendship with Spencer was perhaps the most antagonistic because Spence didn’t let herself get pushed around or manipulated by Ali (at least not as much as the other Liars did). They still loved one another, though, and watching Ali “visit” Spence while she is in Radley in Season 3, Episode 22: “Will the Circle Be Unbroken?” is a welcome respite from Spencer’s spiral into depression. Ali puts on a record and dances with Spencer, telling her to pretend she’s getting ready for her first boy/girl dance party. We like to think Ali makes her appearances to the Liars when they need her the most. Though Spencer may not have been in physical danger when Ali visits her, she obviously needed a friend.

What are your favorite Ali moments? Sound off in the comments below!

Catch the Pretty Little Liars Season 4 Halloween special on Tuesday, October 22, 2013 at 8 p.m. ET on ABC Family.

Credit: Celebified Photo: Pretty Little Liars Halloween Special "grave New World" Preview Photos: Ezra Lurks In The Shadows While The Girls Search For Ali!