Loot (1970)

Two bank robbers, Dennis and Hal, are on the run from the police after a successful heist. Needing somewhere to hide the loot, they turn to a funeral parlour where they stash the cash in Hal's recently-deceased mother's coffin. Taking the coffin, they turn to Hal's father and hide it in the bathroom of his hotel. Before long the hotel is host to the eccentric Inspector Truscott.