wasp on the lapel
Any situation where a person becomes unduly panicked and makes ill-advised decisions or movements as a result.
Guy 1: Gerald thought he saw his ex-girlfriend so he turned around to bolt and ran straight into a waitress and knocked her tray full of drinks all over the floor.
Guy 2: He had a wasp on the lapel.
Guy 1: Exactly.
Guy 2: He had a wasp on the lapel.
Guy 1: Exactly.