Best Things to Do with "join"
Sit on a bus, then stomp twice and clap. Everyone else will join in. This only works in America.
Do the hokey pokey in the public bathroom. See how many people stare at you and try to get others to join in.
Go to a busy street and put on the music to YMCA and start doing it, see how nanny people join in.
Walk up to someone in a crowd and sign happy birthday, wait and see how many people join in.
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