The Accidental Time Machine is a Science Fiction book by Joe Haldeman about a man who accidentally creates a time machine and has some quirky adventures with it. The main problem is that the time machine can only go into the future, and each time he uses it, the stretch of time he jumps doubles. He figures that sometime in the future, someone will create a time machine that can take him back home, so he continues traveling forward and exploring the various worlds in which he arrives.