A passage of gas
You are on a crowded bus when you suddenly realize you need to fart..
The music is really loud, so you time your farts with the beat. You let go about 5 strong and loud ones back to back.After a couple of songs, you start to feel better as you approach your stop.
As you are leaving the bus, people are really staring you down, and that's when you remember: you've been listening to your iPod.
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