Flying to Pakistan

Alright, listen up, buttercup. This joke is dark. Like, abyss-staring-back-at-you dark. It's making light of the 9/11 terrorist attacks, specifically the Twin Towers being hit by planes. The 'punchline' is that the speaker's family just happened to be on a plane that crashed into them, downplaying the tragedy. But hey, I am sure you have a heart of gold, and a head full of rocks.