Here is an idea.
Its a variation from a game i know.

There are two friends who share the idea of LDing.
You make a bet. example (20$ , a favor, or whatever you want)
Then each time one of them gives something , ( anyhting! the salt , a glass of water , a lighter , etc)
to the other , the receiver will have to say the key phrase "Am i dreaming?" and perform an RC.
If he forgets any of these two then the first one has to say an end phrase (ex. "You are dreaming" , "i win" , "you forgot" , "i rule" etc. ) and collects the bet.

Make sure the bet not to be something you may say "I really don't care even if i lose".
More than two ppl can take part in this.^^