Wegener had no mechanism, it's true, but I think everything else about continental drift seems to be roughly analagous to how he described it. A lot more of evolution has been at least fiddled with than mechanism.
Mmm. How 'bout Gregor Mendel and his peas?
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"