Since youve gotten into electronics, havent you wondered if there is a fart sensor out there? I sure did. I discovered that if you use a methane sensor, especially the MQ-5, even at very low concentrations, it reads farts. What if you combined that into a hat with an LED Bar Graph and a XBee? Exactly. The Gas Cap was made with that in mind. For around $100, you can build your own Gas Cap, a human gas-operated LED Bar Graph on a hat. So, you fart into the methane sensor, wirelessly transmit that data to the hat, and watch the LEDs light up so that your friends can see how horrible it was.