Rising Damp S1E4 (All Our Yesterdays)

Spooner the wrestler has tripped over Rigsby's cat Vienna and is confined to his room with a broken leg. He plays his radio at full volume, annoying the other tenants and threatens Rigsby when he tells him to turn the noise down. Suddenly in nostalgic mood Rigsby gets his souvenirs from his service days in World War Two to show Philip and Alan, including his revolver, which goes off. Spooner pretends that Rigsby has killed him with it and plays dead, to have a joke at the landlord's expense. However it turns out that the bullet has actually killed Spooner's pet goldfish so Rigsby asks if he can have it for the cat.