What weird things do your customers do? I have a guy that pays more than he has to every month. When I asked him about it he said he knows he does it and the reason he does it is in case he forgets a month (he hasn't forgot in the 5 years he has been a customer). So for the past 5 years he has had at least 1 month of credit. Another customer insists on giving me a dr. pepper after I'm done (I hate dr. pepper) cutting the lawn. I just bring them home to my wife. I had a customer that would turn the irrigation system on after I left. It took me about 5 months to figure out why I couldn't kill the weeds in her yard. The best is the customer that covers the dog poo in her back yard with plant pots. I learned very quickly not to pick up the pots after I got a hand full of poo.