You're a magician in trouble if:
If you think you can't perform without cards.
You do a perfect classic force, then realized you forgot your force card.
You do a trick with an iPhone, and expect astonishment.
You shake hands with someone wearing a metal ring, when you have your PK ring on.
You do sword swallowing, and realize the stage manager handed you a real sword from the last set in a hurry.
You do Interlaced and realize you put the gimmick on the other shoe.
You use ellusionist cards for magic.
You only know card tricks.
You think you can't palm
Your tarantula runs out of batteries mid-performance.
You start a koslowski bill switch, and realize you have the same kind of bill on your TT.
You are doing something with the Change Cap, and realize you forgot to load it.
You mix up your Outlaw wallet with your real wallet.
You like Brian Tudor.
You vanish a lit Cigarette with a pull, and it doesn't quite go out.
You perform Meir Yeddid's Finger Fantasies for kids who accidentally got their fingers cut off.
You bought Cookie Cutter
You use a PK ring to stop someone's expensive watch, and realize your broke it.
You perform Paul Harris' Ladybug, and realize your ladybug died.
A coin "talks" against your ring, and the spec thinks it's a second coin.
You do a lit match vanish by dropping it on the floor, but you drop the lit match on someone wearing flip-flops.
You do Gregory Wilson's Ring routine, and someone punches you in the face when you throw the "ring" in the water/far away.
You're doing a coin routine and you drop a shell; and the spectator, being nice, picks it up for you.