L'emmerdeur (2009)

An hilarious French farce, Francois Pignon, whose wife has just left him for a shrink, checks into the same hotel as hitman Ralph Milan. Ralph is there to stake out a key witness in a major corruption trial in the law courts opposite the hotel, while Pignon plans to hang himself in the bathroom ! Their adjoining rooms bring them together; the perfect killer and the perfect pest and riotous complications that cement their relationship.

Official website: http://www.tfmdistribution.com/lemmerdeur/