Haha, one time my brother didn't have anyone to dare him to do something stupid, so he was like, "Hey, Andy, do you dare me to drink this glass of white vinegar?" So I was like, "Huh? What? Sure. Go for it." So almost to my disbelief, he drank a near complete 8 ounces of this stuff. In less than a minute he was in the toilet puking. He gave me the same glass asking me to fill it with water. What did I do? You guessed it. I filled it with more vinegar and gave it back to him. He took a swig and then spat it on the bathroom mirror and sink. Surprisingly, I didn't get a beating for that.