That's great. I can just imagine the look on this guy's face as he was being lectured by a kid probably half his age...
The funniest one I can think of right now is actually how I got my first aquarium. I had had a betta fish that lived in a bowl on my dresser for about a year, and I loved him so much. He died while my aunt and uncle were in town visiting, and I was so upset that my aunt told me she was going to take me to get a new fish. My mom agreed, and we went off to the LFS
. Once we got there my aunt revealed her plan - a bowl was no good so she was going to get me a 10 gallon setup! We got the tank, filter, heater, gravel, decorations, everything. Loaded it into the car and brought it home. Man, was my mom mad. But luckily for me, this was her favorite sister in law who pretty much helped raise her, and she just couldn't say no. The tank actually cracked when we were getting it home, and she let us go return it for a new one instead of having us return everything. We got it all set up and waited a few days before going to get some fish, since apparently none of us knew anything about cycling lol. Remember that this was a few years before Internet access was a common thing, and long before I had it. I was probably like 7 years old, and I've been keeping fish pretty much ever since, with only a break for about two years when I was living in a dorm and it wasn't allowed.