Somebody wanted to make a Vampire ale a few weeks/months back. I'm pretty sure slicing someone's neck open was one of the first steps in the brew session anyway. I can't remember if they were adding the blood to the boil or doing First Wort Blooding, though.It's just water. Worst case scenario is that condensation builds up on the lid, you remove it, the water goes onto the floor. Then you slip, fall and slice your neck open on the ball valve of your MLT.