ok this is gonna be a great one
Chris Klein was in Rollerball with LL Cool J
LL Cool J appears on the Space Jam Soundtrack with Coolio
Coolio Sang the Theme Song to Keenan and Kel
Keenan and Kel had a spin off made for tv called Two Heads are Better than None, in which Milton Berle played a small role.
Larry the Cable Guy and Buster Keaton