I feel like this only works in small groups. Have you (repeatedly) done this in bigger groups? I feel like that's a great way to make everyone hate you. Although I must say that sometimes I have asked this question, and people seemed thankful because they also didn't understand a thing, but simply didn't dare to ask. This is a bit tricky, because if nobody asks questions, I feel like they all understand and I'm the only dumb one who doesn't get it.