Farting in public can prove to be a rather embarrassing situation for just about anyone, especially when you are stuck in an elevator and everyone knows that you are the culprit. Of course, it would help the situation if you could let loose one of those ‘silent killers’, but for those of us who have a penchant for playing tricks on others, then the $8.99 Farty Pants Sound Machine Keychain is certainly a must-have in your arsenal of tricks. This unique keychain will deliver 4 funny fart sounds in a mini pocket size, and since it comes with batteries, it is ready for action right out of the box.