You post three things about yourself! One of these three things MUST be a lie! You must guess which one is the lie. If you get it right, you go next

So i'll go first:
1. I once accidentally stabbed a girl in the arm with a craft knife
2. A log was thrown into a tree to get conkers down, i ran under and boom. Trip to A&E with a cut open head.
3. I once decided to put fairly liquid on a bouncy castle, slipped out of it and broke 3 fingers as I landed.
Which is the lie?