I used to do a similar clicking thing a few years ago at
http://homokaasu.org/killeveryone/kill.gas
Basically everyone who clicked, had to click 6 billion times (1 for each person in the world) for the game to end.
I clicked 2,754,487 times over the 6 years. (auto click programs are banned and they run regular security checks)
http://homokaasu.org/sect/user.gas?67884
Pretty sad huh
- Mark