Form two single-file lines. Have the lines get in order during each round:
By birthdate, height, distance of home, weight, size of favorite animal, alphabetical order of first name or last name, favorite fruit, favorite animal, etc.
For each round, have the two lines face each other and find a partner from the other team to do Rock-Paper-Scissor. (e.g.) Person #1 on team 1 will be facing Person #1 on team 2. If someone has no partner, he/she watches for that round. For the next round, after the line has been re-ordered, each person will have a different partner.
Do Rock-Paper-ScissorÂ