Its from a game called Escape From Monkey Island 2, by Lucas Arts. Point-and-Click style where you have a lot of talking and its main point is to be funny. The original tongue-twister is of unknown...
He'd do as much as the dew drops do if the dew drops do drop dewI'm not sure how many other people know about that but I've been saying it since I was a child
if a woodchuck could chuck wood, then a woodchuck would chuck, as much wood as a woodchuck would chuck, if a woodchuck could chuck wood
Everybody knows a woodchuck would chuck as much wood as a...