Lupin III Part V: Fujiko Mine (Episode 18)

This filler episode was when Lupin finds his hotel bathroom's toilet gets clogged by something small. In order for him, Goemon and Jigen to find the sorcue and to get their own privacy, they had to put up their own restrictions which ended with friction along them and it didn't help that Fujiko kept the bathroom locked to herself, and preventing the plumber to come over and fix it. It is revealed that Fujiko's anniversary gift for Lupin was the reason why the toilet blockage happened.

A GIF