91:an Karlsson muckar (tror han)
- Originální název: 91:an Karlsson muckar (tror han)
- Režie: Åke Grönberg
- Hrají: Fritiof Billquist, Holger Höglund, Stig Grybe, Gun Jönsson , další...
In the last film of the original 91 film series two letters - one written in spite and another in love - end up in the wrong hands, while 91 and 87 as usual try to avoid ending up in military arrest.
