What happens when I get too cocky (Destiny)
I'm not a very good PvP player, but sometimes I pull off two quick kills and I sorta pat myself on the back. This is especially true when I'm going for Iron Wrath, which I usually have a hard time with. Well, I landed two quick kills, was feeling pretty good, then the Destiny God's delivery to me a deafening reminder that I'm not-all-that.
http://xboxdvr.com/gamer/Finwe%20of%20Noldor/video/4356791
I'm pretty sure I let out a little whimper combined with "mothe..." a fraction of a second before impact.

What happens when I get too cocky
I'm pretty sure that's called being B!@#$ Slapped by explosives.

My 2 cents.
Should have wielded your sniper before you approached that wall. You were lucky they didn't hit you the first time you poked your head out. That being said, great patience on the first hit. That was a great shot. You had potentially 2 other snipers aiming at you and you took the time to get the headshot, really impressive.

What happens when I get too cocky
Sniper headshots do make you feel bad ass. So do rockets to the face and supers, but those take minimal skill. :)