Iron Golem killed me twice on my first run (which I'm not done with yet), but then I realized I was being a dumbass. Sorta felt the same way after Quelaag. --- If you can see this sig, that means I'm not being sarcastic or trying to troll.
I love that fight, just because I love watching Tarkus go to town. It's a nice break because I usually end up with more deaths than I like in Sen's. My body is attracted to perilous ledges. --- This is a unique signature. I've put it here, so hopefully when you see it again you'll think "Oh yeah, that guy with the stupid signature!"
Actually, most bosses in this game are kind of easy... The first time I played it, I overestimated the gargoyles and went Rocky on the goons, levelling up around that area before I even got to them.
Iron Golem was the same... I was expecting insanely fast, hard hitting boss who would make me fall to death easily at the same time, because of how that whole place is set up. How relieved I was to see that it was a giant in a rooftop... I went to town on his legs and the way he fell... Man, that was still a funny, satisfying moment.
Pinwheel was funny. That cool intro, then he died in a couple of combo from the black knight halberd.