Arrange the chairs for your group in a circle with one less chair than people.  Choose someone to be "it" and stand in the center of the circle.  The idea is NOT to be in the center any longer than you have to be.

Have "it" make a statement regarding anything, although typically they have to do with something they are wearing, have done, own, etc.  If there is anyone who that statement does not apply to, then they must get up and find a new seat.  If they get up, they cannot take the seat to their direct left or right or the seat they were just in.  If the statement does apply to them, they stay seated.

When people leave their seat, "it" tries to get in it before anyone else does.

Examples:

"I have never flown on a plane."  (Everyone who has must get up and find a different seat while everyone who has stays seated.)

"I own three dogs."  (Everyone who does NOT have 3 dogs must get up and find a different seat while everyone who does stays seated.)

"I'm wearing blue."   (Everyone who is NOTwearing blue must get up and find a different seat while everyone who is wearing blue stays seated.)