I only just discovered this thread, so obviously everyone's already beaten me to the best ones. Anyway, here are two favorites, brought to you by the magic of the quote button.
herr gruber said:
"You don't know him! You don't know him! You don't know him!!!
salussolia said:
wha wha wait Collin?? as in Collin Williams you you married him I introduced you!!
I didn't see it in the thread
(I've given it the most cursory of glances so far), but I love Indy's reaction when he discovers that Mutt is his son. "Why didn't you make him finish school?!"
"I like Ike" was classic, though I had to explain it to my sister (15). What ARE they teaching them in schools nowadays?