I once went to the loo after cutting some seriously hot evil little south asian chillis, the type which should come with biohazard warnings. I actually got blisters on my fingers from them later ;-)
Unfortunately I hadn't washed my hands properly before going to the bathroom.
Hours of excruciating pain with an additional bizzare side effect caused by the increased blood flow. You can imagine what that was. Suffice to say I could carry the tray with no hands afterwards...