When James Avery showed up on Family Matters

I actually remember this clip way back in the day.  This prank/outtake happened way back in 1993.  The Fresh Prince show was on the air and was a huge hit.  Avery was just finishing his run as the voice of Shredder on TMNT and was still doing his gig on NBC.  He showed up on a different network to do this cameo/joke/prank.  I guess the writers/producers/director pulled this prank on Reginald VelJohnson.  When you see Reginald's reaction, it is very real.   

I always like these outtakes.   The fact these two actors were on two networks didn't bother the producers and it is a nice tip of the hat to each show.  You really can't do that now.  Remember the Ally McBeal/The Practice crossover?  Besides, you couldn't have a true Fresh Prince/Family Matters crossover because the Fresh Prince show was fictional in the FM universe...perhaps you could retcon it.