history: One time I let this guy crash on my couch. He seemed like a nice guy, but he took advantage of me. I found out he was eating all my food and stealing money from my room. You ever have a situation where you help someone out and just end up regretting it?
current: yes, that is always a hard situation.  
next: Yea, I once let this guy crash on my couch rent free for 3 months, and the entire time he was taking money out my room and eating my snacks without saying anything. I knew things were missing, but he'd always deny it.