In 1986, at the height of his career (as It's Garry Shandling's Show was starting), comedian Garry Shandling did a Pizza Hut ad. Here it is:

It appears to be part of a major campaign, also featuring standup comedian Roseanne Barr (whose show Roseanne didn't start until 1988), actor Pat Morita (whose turn in The Karate Kid was in 1984), and actress Rita Moreno.

Oh, and don't forget that you used to be able to get free Crystal Pepsi with your Pizza Hut pizza!