Cry.

I know of only a few times when my Dad has cried other than for a movie like Forest Gump, or Dead Poet's Society, or, most recently I'm told, Up. But he's told me about how he cried when Lennon was shot. And I've seen him cry when this song comes on. Lennon was something unique for his generation, and rightfully so, I think. I know of no other figure like him. Perhaps Thoreau. Yeah, that might work.