Yeah but not a lot, it gets old if you over do it in every day conversation. Pretty much what Doppel said.
Hmm... i suppose I have seen so many movies that i never really repeat myself.. Or rather, its quite rare. But i'll be talking and then it will just fit in with my sentence and ill say whatever it is then continue on.
and "It happens, but mainly to goof :]" where are you from? i havent heard that expression for a long long time...
anyways i think it makes conversations more interesting not less so.. in that using regular lines over and over just gets boring and all together dreary.. i find that if i throw in a line from whatever movie it 'spices' it up and at the very least it amuses me