Although instead of cancer, one of the tenants had a debilitating mental break. 

Put your mental energies to something else.

If I had ANY doubt as to his mental condition, I would contact lawyer/police.

@Joaquin CamarasaI'm going to pass on this as many of my "crazy tenant" experiences clearly involve underlying mental illness.

How many days can a human last without proper sleep before going mental?

I knew this would happen eventually, but I still don't know how to overcome it mentally. 

Kinda on subject and kinda off: I really disagree with the new school mentality that gives all kids ribbons for going to an event, whether they worked as hard as the guy next to them or not. 

also you should of had a walk though and inspection so take a mental not of what thing need to be fixed.

A few months back I rented to a person that has this mentality. 

We like helping seniors or mentally disabled people in group homes.