YOU save the entire Universe!

There's a military test zone outside of town, where they're exploding gamma bombs. This is you're chance! You hop into your jeep and drive straight for ground zero, Rick Jones style. (Fortuitously, there were no fences or guards or anything.)
Suddenly the horizon is filled with a vast mushroom cloud. BAROOOOMMMM!!!! Everything turns green and your jeep explodes. You are picked up by the howling nuclear wind and hurled back five miles.
You wake up in a military hospital. A doctor leans over you and says, "That was a pretty f****** stupid thing you did, son."