I've got few wild things.
At 17 I was arrested for inciting a riot for out-shouting a bunch of protesters.
At 19 me and two of my army buddies fell asleep on a train after going to a concert and ended up in communist Czechoslovakia. That was an accident, and it was during the cold war. We managed to get back without causing an international incident, but it was still pretty wild.
At 21 while working the graveyard shift at a 7-11 some punk that thought he could intimidate me since he had 3 buddies with him and picked a fight with me. I let him hit me once, then threw his ass on the ground and held a pistol to his head until the police showed up. The wildest part about that was that the police thought I was trying to rob the place and that the asshat I was holding down was the clerk.
At about 32, skydiving, over and over one summer until I wiped out my savings account. Talk about an adrenaline rush, nothing tops free-falling for 10,000 feet.