To hype its inaugural Comedy Week, which begins Sunday night at 8 p.m. ET, YouTube turned to an ad agency known for generating its share of laughs: Goodby, Silverstein & Partners. The San Francisco-based shop's New York office whipped up a load of ads (many of them :15s) that have been airing in recent weeks starring the Comedy Week's actors and comedians. Check out a whole bunch of those spots below. (At the bottom is a longer promo with Arnold Schwartzenegger, which YouTube produced in-house, but we have to include because it's awkwardly hilarious.)