I was working part-time for my university's building & grounds crew. One day two of us student helpers were assigned to help a carpenter who was re-attaching some countertops in a room after some remodeling.
One of them was an 'L' shape, and fit in a corner. We had to hold both ends, and the guy had to lie down and guide it into place, then replace the screws as we tried to steady it.
It was heavy, and we didn't seem to get it quite right, so he braced his feet under it and tried to add the strength of his legs to the aim and the effort.
After several minutes of this, we said..."C'mon, Gene...this is getting heavy..what's wrong?"
"It ain't easy," came his voice from below, "did you ever try to lie on your back with your feet in the air and screw above your head?"

I bent over, peeked at him, and asked seriously, "Gene...would you like to rephrase that?"

He started laughing and damn near dropped the counter on his head.