Fletcher (Villager)

Fletcher canonically learns every villager profession (and is fired from them because of... lesser displayed effort. He still retains apprentice-level skills of each job, though)

Shepherd - 3 emeralds -> 1 bed
He was fired because of his tendency to take a nap on the sheep's soft wool instead of doing his job. It's comfy, alright?

Fletcher - 32 sticks -> 1 emerald
He tests out how taut the bowstrings are by... firing the bows. Not really a good idea in hindsight, especially given his terrible skills with one - nearly hitting the town's mayor was the last straw!

Leatherworker - 6 emeralds -> 1 saddle
Fletcher uses way too much dye when dying the leather crafts he makes, to the point where messes are so terrible that even the boot prints he leaves stain the ground. It is a nightmare to clean up.

Armorer - 5 emeralds -> 1 shield
Somehow, even something as simple as chainmail can be messed up horribly by Fletcher. Not wrapping the wire rings tight enough, cutting them sloppily enough to bend their shape, then failing to weave them into a solid and consistent pattern... it's a miracle that it's even wearable as a piece of clothing. Maybe he should stick to making shields...