This letter arrived in the mail recently:
I like riding my bike, but sometimes I get tired. Ideas?
Well, what if I told you that — thanks to the peanut-loving team of scientists at Bobsoldout.com Research Laboratories — you’d never have to pedal on your bicycle again? Because with the Perpetually Downhill Bicycle, you are always going downhill, so you never have to pedal:
Send your requests for new inventions to bob [at] bobsoldout.com, subject: ULTIMATE INVENTIONS.