Credit: Instagram

The moral of this story is: Don't turn your back on Naya Rivera (Santana) when she's in the Halloween spirit. She just might have a trick — and not a treat! — up her sleeve.

Naya's fiance Big Sean paid Naya a visit on the Glee set this week, and they decided to startle one of her Glee co-stars for Halloween.

Kevin McHale (Artie) was minding his own business when the two used monster masks to startle the poor guy. 

On October 31, Kevin tweeted:

To which Naya replied:

Naya then posted a photo of herself wearing the mask in question, along with the caption, "What up doe?!" In the photo, Big Sean can be seen cracking up in the background.

After seeing the photo, Kevin wanted to make sure that history wouldn't repeat itself and tweeted: 

Good call, Kevin. But we don't think Naya meant any ill will with the prank, given that she and Kevin are real-life besties. Indeed, Kevin joined Naya for her wedding-dress shopping trip earlier this month.

By the way, is it just us, or does Naya still look smokin' hot while wearing that monster mask. How does she do it?

Source: Naya on Instagram, Naya on Twitter, Kevin on Twitter