It sure is funny to see the different reactions our pet birds can have while preening and dealing with a fallen feather.
Some of mine play with a fallen wing or tail feather, while others just ignore them.
Sometimes I have to help out when one of my budgies has one of those fluffy white "underwear feathers" stuck on the cere, when they are unable to efficiently remove them.
Very recently I had to intervene and take one that was on Leonel's eye!
The issue was solved on the spot and Leonel quickly resumed to his normal activities.
My flock is well resolved in the feather department, they don't stress out at the sight of them.