... if you can't get the dough right!
Tried twice, failed twice. Followed the Mario Batali recipe, illustrated nicely here.
Used 4 eggs the first time, didn't come close to getting something resembling a nice rounded ball of dough.
Second time, with 5 eggs, was on the verge of something I could take for a maiden voyage on my pasta maker, but then all it went to heck.
I'll try again, soon.