I think Tyr is very smart and always surprises me with the things he does.
One thing he did that really surprised me was when my next door neighbor was trimming some trees and he decided to trim a branch that was hanging over into my yard, so he took his ladder and put it over my fence and climbed up it to reach the branch. Meanwhile I came home from the doggie park unawares and let the dogs out of the car. Tyr-Mr.Noisey that he is, went to investigate. My neighbor went down the ladder into his yard and Tyr watched him. Then he mounted the ladder and started to climb up it!
My neighbor freaked and started to shake the ladder-gently to get him off it and told him to get down. So Tyr stopped climbing and stayed on the ladder for a second -debating whether to keep going or not, then jumped off. My neighbor quickly pulled the ladder back over the fence.
Tyr had never even seen a ladder before that.
Whether he would have known how to get down once he reached the top or not is something I would have liked to have seen.