I know Steve is really talented with his shield and is like an expert with it
but just imagine him smacking it in his face
or tripping over it
or waking up in the middle of the night and he shuffles off to the bathroom only to step on the edge of the shield and it smacks him in the shin and he curses loudly enough to wake up the other Howling Commandos who just sit up and start laughing at the way Steve is holding onto his leg and swearing
Seriously, though, super-soldier or not, watching Steve learn to use his shield must’ve been A+ comedy!
Steve throws it at some HYDRA goons but misses them by a mile and it bounces off a wall and flies out through a window, and Steve is just standing there, whoops, while Bucky rolls his eyes, takes out the enemies with his rifle, and jogs back outside to fetch the shield.
Steve hasn’t learnt the ctrl+c to crouch move yet; he holds the shield in front of his face and a HYDRA sniper shoots him in the thigh. Bucky facepalms because Steve you idiot, the shield only protects the bits of you actually behind it. Eventually, Steve masters the art of hiding his entire body behind the shield, tortoise-style, by ducking and having Bucky chuck pebbles at whatever parts of him are sticking out - of course Bucky has a wicked good aim and an even more wicked sense of humour, and Steve ends up with some rather embarrassing bruises.
The Commandos are on a stealth mission to infiltrate a secret HYDRA base, except the shield slips, falls, and does that rolling-metal-lid-dropped-on-the-ground sound like clang!!-grooiinnng-rooiinng-ooiinnnng-rnnnng-rrnng-rrnng-rrnng until Steve puts his foot on it. Everyone stops and just stares at him.
Also, my personal headcanon is that Steve once bet the shield in a hand of poker and Bucky won it. So it’s actually been Bucky’s shield since October 1944, Steve’s just borrowing it.