Tribute to a Roof Cleaner

Alright, listen up, buttercup. The joke is that the dude's dad was a roof cleaner. Roof cleaners work high up on roofs. So, when the dude says, "Dad, if you're up there!" it's funny 'cause he could be on a roof, but it ALSO sounds like he's talkin' about his dad being dead and in Heaven. I bet you didn't even catch that, you donut.