I’ve googled this, and found 3 websites, all of which refer to a Bugs bunny cartoon. At the end of the episode bugs and Willoughby dog fall off a cliff, but then after falling and falling, land safely, then bugs goes 'fooled ya didn’t we?, then proceeds to fall off another cliff. Apparently in one version, bugs then said:

“Hold on to your hats, folks, here we go again!”, and then the cartoon ends (with ‘that’s all folks’, etc)

However, this apparently wasn’t broadcast, possibly because someone thought it would be too topical, so would date badly.

The cartoon was called ‘The Heckling Hare’, and was apparently made in 1941.

The references are these three sites:

http://lavender.fortunecity.com/fullmonty/22/avery.htm

http://members.aol.com/EOCostello/a.html

http://www.burbankhighanimation.com/texavery.html