il y a une couille dans le potage
Expression USED On Occasion BY Some People
(there is a testicle in the soup) • When something is unexplained or not normal. (We’ll never know if the problem is the only one testicle or the fact that’s in the soup).
"Ma voiture ne démarre pas - il y a une couille dans le potage."
"My car won't start - there's a testicle in the soup."