Another joke came to mind.

Dr. Christian Bernard, who pioneered heart replacement surgery told this one on himself, and it's one of my favorites.
When you open a patient up to replace a heart, you only have about 6 hours to get the new heart in and wasting no time is critical.  As he was getting ready to install a new heart, he put his hand out of the "cat-gut" It's what they still call surgical suture material, I understand it really was cat intestine years ago (Let us sing praises for better technology) and was handed a "wad" of knots.  Not happy at all he starts "attacking" the wad to untangle it, muttering $#@@%& under his breath.  His surgical nurse asks. "may I help? Doctor" to which he replies " NO THANK YOU. I've been a surgeon for 20 years, I ought to be able to do this" and back to "#@%$^&#$#" A moment later the surgery nurse gentle takes it from his hand and twists that and tugs that and the whole mess untangles in her hand.  She smiles and hands it back and he asks, no to politely "HOW DID YOU DO THAT?" She replies "I've been doing embroidery for 40 years"