Scary but funny

My sister teaches two small girls (probably around 7-10) as a part time thing. I had the chance to meet the two last week when I was at her place and she was teaching them. I started talking to them about how school sucks and how all classes should involve alot of ice cream and choclate syrup and after about 5 minutes one of the girls said "You know you look really scary but you are funny" Then the other one said I thought you were here to fix the bathroom. The next day I got both of them ice cream and My sister was furious because I was interrupting the "class" and distracting her students from understanding the rules of English grammar. Anways, back to studying for the GMAT and subject verb agreement for me.