Depends on who the people are, trip a dude with a pistol you might get shot, trip a dude with martial arts skill or just a good brawler, you get ya ass kicked...etc
Well you'll probably embarrass that person and make him feel bad so i wouldn't. If your a good boy then don't start acting like a jerk .People won't like you then. Stay nice! =P
You trip people and just laugh, wow some good boy you are. hahahahahahahaha, i do that with my little bro. but that's family and t hats totally different. or unless its like your bff, then i'm pretty sure its okay hahahaha. but if its someone at random then, ITS PRETTY MEAN!!!