Has anybody seen that commercial where Barry Williams is sitting next to a lady who sneezes? He looks at her and yells "NO!" It is very brief.

Yes, short variations of this commercial have appeared at the end of game shows like Hollywood Squares and Jeopardy!, with various other classic tv actors as the sneezers. Barry mentions on his webpage that Johnny Whitaker and Butch Patrick are among the sneezers, but he doesn't mention Barbara Billingsley, and I think she's in the one I've seen the most.

I stand corrected on my previous reply. On his webpage, Barry just stated that it was Phyllis Coates, one of two actresses to play Lois Lane on the 50s tv version of Superman, who played the sniffling elderly woman.

http://www.barrywilliams.com/ask/answer.htm