The origins of the lake…

A tradition, origin of which is blurred, leaves us perplexed. Why the participants and organizers throw themselves in the lake at the end of the French Robotics Cup?

One of the versions goes back up in year 2000. She tells that it is a bet which is in origin there. An organizer would have bet with a participant that he could not go to search Sundae in Mac Donald' s which is on the other side of the lake. Neither one, nor two, they took off their clothes and are begun in swimming.
They passed to Mac Drive at the biggest surprise of the sellers who transferred arriving from students in underpants dipped and wet instead of a car. They succeeded in coming back, swimming of a hand, sundae in other one, in spite of tiredness, sun and alcohol.

Other versions would go back up in even farther. If you have information on this subject, announce them us.