It's Always Sunny in Philadelphia gag reel clip | EW.com

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Glenn Howerton gets the giggles in It's Always Sunny gag reel

Dennis (Glenn Howerton) threatens to shove his sister Dee (Kaitlin Olson) into a box in a a season 10 episode of It’s Always Sunny in Philadelphia — but according to a clip from the season’s gag reel, the actual moment was hardly intimidating thanks to Howerton’s case of the giggles.

Howerton and Olson both struggle to get through the scene, which includes Howerton spouting out vile lines like, “I will dice you into a tiny, million little pieces,” and, “I’ll shove you into a box, and I’ll put that box into the freezer.” Classic Dennis!

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Watch the clip above, and see It’s Always Sunny’s season 11 premiere when it airs Jan. 6 at 10 p.m. ET on FXX. The season 10 DVD goes on sale Jan. 5.