Watch Matt Cutts of Google and Danny Sullivan stripping during the keynote at SMX Advanced 2009 in Seattle, Washington. The joke is that Matt Cutts has on a shirt under his existing one with a label that says “Matt Cutts”. Danny Sullivan has on a shirt that says “Not Matt Cutts”, clearly helping the rookie attendess who don’t know the two weblebrities.

Our guess is that someone mistakenly called one by the other’s name. Enjoy the clip!