You are compared with 99 other people chosen randomly. If you are better than everyone else in a specific domain, you win 1 million €/$. What do you choose?

Long distance cycling. Compared to the record of 1000+km (~600 miles) in 24 hours I suck, but considering 99 random people I think most won't go for more than 100 miles, so I'm good.

Or oldest stamp they own. Stamp collecting seems to be a pretty dead hobby.