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Least reassuring sign
(sh.itjust.works)
General rules:
Exceptions may be made at the discretion of the mods.
When I was a kid, I had to go to the dentist and as I sat in the waiting room, I periodically heard horrible screams. I, uh, wasn't enthusiastic when they finally called me in. Turns out it was a parrot.
That sounds better until you realize that it would've been mimicking sounds it heard previously.