Dressed as a clown, the clever rascal Grimm holds up the most secure bank of Montreal and takes 30 hostages. While confusing and ridiculing the police with his strange behavior, he calmly manages to rid the bank of a fortune. But then an unsatisfied companion arouses trouble...
| Directing | Alexandre Arcady | Director |
| Writing | Alexandre Arcady | Writer |
| Writing | Daniel Saint-Hamont | Writer |
| Writing | Francis Veber | Writer |
| Writing | Jay Cronley | Novel |
| Production | Alain Belmondo | Producer |
| Production | Bernard Bolzinger | Associate Producer |
| Production | Jean-Paul Belmondo | Producer |
| Camera | Richard Ciupka | Director of Photography |
| Editing | Joële Van Effenterre | Editor |
| Art | Tony Egry | Production Design |
| Art | Jean-Louis Povéda | Production Design |
| Art | Gilles Aird | Set Decoration |
| Costume & Make-Up | Mic Cheminal | Costume Design |
| Sound | Christian Fortin | Sound |
| Sound | Yvon Benoît | Sound |
| Sound | Joël Beldent | Assistant Foley Artist |
| Sound | Thierry Hoffmann | Sound |
| Sound | Alain Lévy | Assistant Foley Artist |
| Sound | Jérôme Lévy | Foley Artist |
| Sound | Gérard Manneveau | Assistant Foley Artist |
| Sound | Jacques Thomas-Gérard | Sound Mixer |
| Costume & Make-Up | Christiane Fattori | Makeup Artist |
| Costume & Make-Up | Richard Hansen | Makeup Artist |
| Costume & Make-Up | Nicole Lapierre | Makeup Artist |
| Costume & Make-Up | Jacques Leymond | Makeup Artist |
| Production | Georges Dancigers | Production Manager |
| Production | Michel Chauvin | Unit Manager |
| Production | Micheline Garant | Production Manager |
| Costume & Make-Up | Serge Morache | Key Hair Stylist |
| Costume & Make-Up | Charly Koubesserian | Key Makeup Artist |
| Costume & Make-Up | Jocelyne Bellemare | Key Makeup Artist |
| Sound | Serge Franklin | Original Music Composer |
| Crew | Rémy Julienne | Stunt Coordinator |
| Writing | Francis Veber | Dialogue |
| Production | Denis Héroux | Executive Producer |