Dave Chappelle stole/copied/ripped off Tupac's Rick James comedy.
Go back and watch Tupac : Ressurection, released in 2003. There is a home video in the movie in which Tupac wears a long black wig JUST LIKE the one Dave Chappelle wears, tupac makes fun of Rick James. Tupac even says "IM RICK JAMES, GET OUT THE WAY!" No joke. Go back and watch it. Tupac died in 1996 so this home video is pretty old, however, it was included in the 2003 movie release Tupac : Ressurection. Dave Chappelle's True hollywood stories Rick James episode was aired on February 11, 2004. Barely 6 months after Tupac : Ressurection's wide release.
Coincidence? No. Dave Chappelle ripped off of Tupac's comedy and never gave credit.