New How I Met Your Mother Season 8 Premiere Promo (VIDEO) Tweet September 5, 2012 at 11:58AM EDT by Rebecca Martin Related: Wetpaint Entertainment, How I Met Your Mother , Sneak Peek , Celebrity Relationships Credit: YouTube Air date: September 24, 2012. Good news, How I Met Your Mother fans: There's a new promo video for the Season 8 premiere, and it is a doozy. We learn a lot in the mere 30 seconds of video. In fact, it gives away so much that spoiler-phobes might want to turn back now.
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