Most of the time... when you're crying, nobody notices your tears.
Most of the time... when you're worried, nobody feels your pain.
Most of the time... when you're happy, nobody sees your smile.
But when you fart just one time...
A stupid person laughs three times at a joke; once when everyone else is laughing, a second time when he actually gets the joke, and a third time when he realizes he was laughing without getting the joke at first.