2 tespoons of vinegar make you vomit?

I did a challenge with a friend he told me a shot of vinegar would make you vomit, puke, throw up, blow chunks, barf, up chuck, chuff, revomitate and otherwise end up with you stomach insides on the out side. He had tried with his father and brother and 3 for three the theory was correct. They all popped. I challenge him. Took the shot waited and nothing but bad taste like soggy vinegar bottom fries. I did 2 more shots and just had a slight tummy ache but no vomit. So statistically 4 out of 5 with not digest dinner with an excess of vinegar.