My local radio station hosts did this kinda thing, where the male host (accused of being too girly by his female co-host because of certain comments he occasionaly made) had to perform challenges to prove his manliness. his challenges were:
1. Swim in a tank full of (harmless) octipi.
2. Chop down a tree with an axe.
3. Endure 3 1-minute boxing rounds with actual boxers.
4. Change a truck tire.
5. Eat a plate of various animal organs (liver, kidney, heart, ect)
6. (I forgot because I didn't listen to the radio that day)
Anyway, I enjoyed this concept, so I'd start the same thing here. You can state your greatest or weirdest acheivement. It can be game based or not, but my contribution is:
Punch the head off a (live) Deathclaw with a powerfist in Fallout: NV (yes I'm still playing this because my computer died while I was playing and I only just got it reinstalled).
And............Go!