Today was fun. I had to run 150 ft. of 12/3 Romex from the garage panel, up over the 2nd floor ceiling then back down to a wall on the 1st floor. There's no real access to above the garage so I had to crawl over the furnace, do some gymnastics to climb over some cross beams, and then walk on the joists hoping to not fall through the ceiling. After that, I had to crawl on my stomach over fiberglass insulation over the 2nd floor while trying to fish the wire over to a space where there was access.
Thankfully it was a cool day.
Oh, and while doing this, I found out they had missed insulating over our laundry room (right next to the garage) when they built the house almost 3 years ago so I'll have to take care of that as well.
EDIT: Oh, and I'm getting too old for this shit.