In those cases the flea you have in your ear (for the French la puce á l'oreille) will have made you suspicious...unless you're a French Mediaeval person, because in Mediaeval times the fleas in French people's ears used to torment them not with suspicions but with desire.
Photo by CDC/Janice Haney Carr
Mind you, if you're Dutch then to have a flea in your ear means you're feeling restless.
Rather thrillingly, a restless German speaker's ears are completely clear of all hopping insects. For a German speaker Ihm ist eine Laus über die Leber gekrochen: a louse has crawled over his liver.
Actually, given the choice I think I'd settle for the flea.
Word To Use Today: flea. The Old English form of this word was flēah.