Pick Van Damme's worst line-reading in Timecop
Yes, it's hard to pick just three out of all the many lines that JCVD fücks up in this movie, but here are my favorites:
A) 00:10:34 "I don't bake cookies for a living."
B) 00:39:28 "Looks like safe sex to me."
C) 1:00:05 "The prototype was never dismantled."
My personal #1 would be A - during their conversation Mia Sara keeps pitching him these one-liners, and he keeps striking out.
Of course, your fave might be a different screw-up altogether, so feel free to improvise.