Well, I know a story. There was this guy at a party. He didn't realize the cake had a lot of dairy in it. After eating a big slice, he started to feel really uncomfortable. His stomach made the funniest noises and he had to excuse himself in a hurry. It was so embarrassing for him but quite funny for the rest of us who knew he was lactose intolerant.
Sure. One time my lactose - intolerant friend accidentally drank a big glass of milk thinking it was almond milk. He spent the whole afternoon running to the bathroom. It was both hilarious and pitiful at the same time.
My cousin is lactose intolerant. Once we were on a trip and stopped at a small café. She ordered a coffee not knowing it came with cream. She took a few sips and then started to have cramps. We had to find a pharmacy quickly to get some medicine. The whole situation was a mess but looking back, it was quite funny how things unfolded. We learned to be more careful about what she orders after that.