My wife and I both get mad when we see people leave the toilet without washing their hands. Last week I was taking a pee in the supermarket toilet and this dirty sod marched out of one of the cubicles, then straight out the door. I quickly washed my hands and followed him; he'd had time to disappear, but guess where he was when I caught up with him? In the fruit & veg department, squeezing bloody mangoes!
I mentioned it again to my wife this morning, saying I'd felt a bit guilty afterwards for not telling a member of staff. I wasn't about to tell him I'd seen him putting his cruddy fingers all over the mangoes; he was about 25, way over six feet, and might've said "How about I put my cruddy fingers around your throat, you interfering little bastard?"