Do an LN2 benching competition, head to head, but do something like in those cooking shows.
Example: There's only one Cryogenic container so the two or three or four teams have to keep stealing it off each other to keep their cpu from melting.
or: The LN2 has to be carried to the rig by hand
or: The person pouring the LN2 is blindfolded and the team mates have to direct them without physical contact
or: The person doing the overclocking has to use an oversize keyboard where each key is like 1m^2 and they have to jump really hard on it to activate it.
oh wait i dont have facebook nvm