Fart Pedal
From the description on the Kickstarter page:
The Fart Pedal turns your guitar noises into fart noises!
Since the beginning of time, guitar players have been enhancing their guitar sounds through the use of guitar pedals. Whether it's to achieve classic distortion, chorus, wah, or phaser noises, most guitarists plug in to a variety of pedals to produce their signature sound.
Now you can lace your signature sound with some truly epic farts.
The fart noises generated by The Fart Pedal aren't your run of the mill Spencer Gifts fart machine toots. I worked with an award-winning sound design company in Chicago to develop bespoke, custom fart noises, for which I hold the exclusive license. These fart noises have been tailored specifically for a guitar amplifier, and tuned for exceptional live or studio performance.