So I'm in petsmart last week buying dog food for my 4 dogs, I don't buy too many fish from them but like to go over to check out their stock just in case they may have gotten something I like. So these two construction workers or guys dressed like construction workers walk in and head straight to the fish section. One of the guys asks the other how big his tank was, I could tell the guy really doesn't have a clue what size his tank is and starts to look for a tank he thinks may be the same size as his as a reference. So now I'm locked in on their conversation. The one guy who asked about the tank walks off in a different direction while the other guy comes and starts looking at the fish.
Guy: Oh this is a nice Jack Dempsey
Me : That's not a Jack Dempsey (Blue Peacock Cichlid)
Guy: It' says on the sign it's a JD
Me: They may have had one in their previously and forgot to remove the sign
that's a blue peacock.
Guy: Oh, you know a lot about fish.
Me : No , I have three JD's so I am familiar with what they look like. What
Kinda fish are you looking for?
Guy: My oscar just died and I'm looking for some cheap fish to put in my tank to see if they live.
Me : What?
Guy: It's kinda of a funny story, my wife was complaining about how dirty the tank was so this sunday I decided to clean it, it had a lot of that "white algae" on the top and sides so I got some CLR and cleaned it off and added some more water.
Me:

You put CLR in your tank with the fish in it?
Guy: Yea, after the football game was over I looked in the tank and my fish was floating upside down.
Me: Have you emptied the tank, rinsed it the gravel and the filter thoroughly? You can't put any more fish in there until that tank is cleaned. You're basically gonna have to start all over and cycle your tank again before you add any more fish.
Guy: No I just changed the water, and my filter is broken so I'm gonna get a new one today.
Needless to say I spent another 15 minutes explaining what "cycling" a tank was, advising him to purchase a test kit(he didn't know they existed)showing the guy what a python was and how it could make his tank maintenance so much easier and effective, (he decided to buy one online because they were too expensive at the store). After that I gave up and walked away

I went home and told my husband(who knows a minimum at best about fish) and even he said what an idiot!!