in tv and the movies, there isn't any dead time. things are scripted, but they appear to us as spontaneous events, the spontaneous events of supposedly real (inside their universe, anyway) humans. so we expect interaction in the real world to be like that: to have no dead time, and to always have something interesting going on.
it's a very tough standard to live up to, though. no matter how quick you are, it's hard to come up with things on the spot that are as rich as things that people spent time concocting. it's hard to have the surroundings be as perfect for the storyline as they are in the movies. it happens, from time to time, but it's rare.
things go wrong in the movies, to be sure, but they go wrong quickly. they don't have the stasis that can characterize human interactions. it's precisely because we're supposed to buy the people on the screen as real people that things go wrong; certainly no one expects their blind date to be like homer simpson or yogi bear, but people like chandler from friends or rob from high fidelity are not out of the question, at least seemingly. but in real life people don't have the same wit or excitement, constant excitement, in their lives. it must be doubly worse to be that actor having to play oneself without a script.
we're doomed.