Dave Chappelle: 'Today' Show Crasher [VIDEO]

Dave Chappelle was banging on the window at the "Today" show this morning -- but the stunt was just as transparent as the glass.

Matt Lauer feigned surprise when he just happened to notice the comedian hyping his show from outside.

Lauer took a break so he could walk outside and interview Chappelle about his upcoming shows at Radio City Music Hall ... and it was just plain weird. Lauer happened to know the first 5 shows sold out immediately, so Dave is there trying to sell tickets to 4 additional shows.

The way to sell ... be funny. And it really wasn't.