Grandpa's Last Flight

Alright listen up, Chucklenuts! This joke is dark because it starts out all happy-go-lucky about the dude's grandpa being a pilot, but then BAM! He drops the bomb that the grandpa died on 9/11. You see, 9/11 was a really bad day when a bunch of planes crashed into buildings and a whole lotta people died. It's tragic, and this joke makes light of it. I can tell you're not smart enough to see that.