I think it was “tomato” and they unexpectedly asked him on live camera while someone behind the camera held up a sign with tomato spelled incorrectly.
If I’ve got it wrong, someone will correct me, I’m sure!
:-)
I’m sure it was potato. Same thing though. Tomato, tomatoes, potato, potatoes.
Here’s the story of the infamous “potato”.
http://www.washingtonpost.com/wp-srv/politics/special/clinton/frenzy/quayle3.htm