I'm trying to understand this question a bit more. Do you mean intentionally not typical for it's genre, or unintentionally?

If intentionally, I'd go with Shaun of the Dead, though it's actually considered part of the 'comedy horror' genre so wouldn't necessarily consider it 'lying' about being hilarious film about a zombie apocalypse.

If unintentionally, then hands down Troll 2. You can't piss on hospitality.