I put a hazmat sign on my little dorm fridge. On the downside, I was afraid someone might put epoxy syringes in with my lunch!
On a side note, to keep the guys out of my desk drawers, I added a little something special. A female "thing" - top and center! Little tricks you learn being the only female in the lab for over 20 years!
Ah the "joys" of having your desk space inside the lab high bay.