For your Graduation party theme, here is a game idea that can be altered to fit the Graduation party theme.
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Party Games for more free party games. Kindergarten, elementary school, junior high, high school and college graduation is a special time to celebrate with a graduation party.
SNAKES DANCE: Say to all the present that you are going to act as a snake tamer and that you are going to show "the snakes' dance" to all the present. Fill the vessel with any mixture. Then begin to spill any liquid on this mixture. (While spilling pretend that you do it very carefully.) Ask all the present to go away from the vessel and wait when "the snake" appears. As a rule, in every company there are some skeptics, who don't believe in it and would say that they have seen such things at the chemistry lessons at school. On the pretext of that you need much noise for "the snake" to appear, ask 2-3 persons to come to you. Ask them to stand in front of all the other guests. Ask them to clap the hands, to stamp their feet, to cry etc. After all these things have been done the snake still doesn't appear. Then ask your guests pardon and say that instead of "snakes' dance" all of them have seen "the dance of tamed monkeys".