'I need to return all of these fish'
(hands me a bag full of 8 big cichlids, 2 receipts)
'I had a leak in my tank and they all died..'
(I call over co-worker who sold him 4 of these cichlids)
"Hey didn't this guy tell you he had 2 tanks, which were 80g and 50g?"
(coworker: yeah, that's the guy)
"Didn't you tell this guy he couldn't buy anymore fish, as his tank would be overcrowded"
(coworker: yep, that's him)
"So your telling me.. You purchased 4 big cichlids from our store, 4 big cichlids from our other store, and now you want to return all 8 of them because your tank 'HAD A LEAK?!?'.. what happened to your second tank? Did it get a leak at the same time? Did you not have the chance to save them? Did you just watch the tank leak 50g of water all over your house, and let the fish gasp for air and die?"
'Uhhhhh'
Long story short.. I kicked the kid out, informed him that he lied to my face and I didn't appreciate it, and he could never buy fish here again. I told him next time he tries to lie about stocking his tank, I hope all of his fish die again.