I definitely live in a house full of boys.
At dinner, if somebody burps, it is greeted with uproarious laughter. The laughter is broken for a brief instant to hear a stilted "excuse me."
Same thing if somebody farts.
Though that, thankfully, is not usually at the dinner table.
I've convinced my son to eat more than one dinner by showing him how some kind of wild animal also consumes that same dinner. Salmon? Grizzly bears eat it. Ribs? Lions eat meat off the bone. Salad? I showed him the scene in Jurassic Park of the brachiosaurus eating greens. It's a pretty gross technique, but it seems to be working.
Today, the following conversation was heard coming from the hall bathroom:
5 year old son: I have to pee!
3 year old son: But I have to pee, too!
5 year old son: Let's pee at the same time! One... Two... Three...