I dunno about actually shedding tears, but I've gotten emotional over a lot of joints. But for me it's a little different. I was an English major in college, I'm a screenwriter, etc. Basically I have a unique relationship with words. So anytime words are put together in a certain way, just the creativity of it makes a nigga emotional, if it's coupled with deep subject matter.
Killer Mike's first verse on 'God in the Building'.