Caution: Overly Tall Morons Might Hit Heads
Not sure whether this would be the most trouble I have gotten into, but it did have the potential to be so.
What happened? When I was in primary school (aged about 10 I suppose) I hit a kid with an iron bar across the head. I hid under the school building all day before going home at home time. The teachers had been searching for me all day. The following day at school nothing happened – seems they all forgot about it.