I actually used that line as a slug (story title) in This is True way back in 1994. I’ve seen it attributed to Kurt Vonnegut (1922-2007) as “Those who believe in telekinetics, raise my hand.”* …but I think the way I said it is better. (Everybody wants to be an editor!)
*Supposedly the full context: “Those who believe in telekinetics, raise my hand. Those who believe in magic, mystify my hand up. Those who believe in God, pray for my hand to be raised. Those who believe that there’s a rightful and scientific explanation for everything… continue.” — but I’ve not been able to verify it.
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