Overhead bins and buses with doors that were lower than anticipated, mostly. A few of them really almost knocked me over. And, to be honest, I lost track of exactly how many times I hit my head. It was either 21 or 22, I honestly couldn't remember by that point.

The best part of the thumb injury? We got it cleaned (even though it just kept bleeding for a while) and tried to put bandages on it, but it's kind of an awkward spot, so the bandaids wouldn't stay on. So we went with gauze and drafting tape.