The Aggie's Time Machine

After years of research and tinkering, the old Aggie professor finally finished his time machine.

"What are you going to do first, prof?" asked his student.

"Well, I reckon I'll go back time and kill Adolf Hitler."

So he gets in the machine, turns it on, there's a loud whirring noise, some smoke, and finally a burst of light. The professor looks disheveled.

"What happened, professor?"

"Well, it wasn't easy, but I found that sonofabitch Hitler hiding out in a bunker, so I shot him in the head, and made it look like a suicide!"