You stumble on a magical lamp in the desert. You rub it a few times, and then a genie comes out offering you to make just one of your wishes reality. You wish for a time machine, but unfortunately for you, the genie is a smart ass, and even though he makes your wish a reality, you end up with a time machine that’s pretty much useless to anyone, unless you have plenty of time on your hands

[Source: The Grohl Troll on Reddit | The Grohl Troll (Official)]