child of the night

I was in class and we are doing a project and both my group mates are older than me but since we have known each other the age gap doesn't exist. So we were planning a fake trip and we had to get tickets and one of us (the tallest) said that we needed 2 adult tickets and 1 child ticket. The other group member (oldest but the shortest) was like come on man because he thought we were teasing him about his height (which we do a lot.) Then I came in and commented that I'm only 17 and he took a few moments to realize that I was the child ticket. Me and the tall friend were dying on the floor laughing because of how he had responded.