I make the child do a time-out (if it was intentional, of course) and apologize. They will not leave timeout until we've discussed what was wrong AND the apology is made. It's just common courtesy and teaching good manners. I don't feel it's a "get out of jail free card" or and eraser of what they've done, because they are also doing the timeout. You can't go around bumping into people (even accidentally) and not saying a word.....it's rude and they're old enough to learn that.