I put a shelf on the wall behind my bed a few months ago. It held up for several weeks, then as soon as I let my guard down it fell off in the middle of the night with a hellish amount of noise.

Last weekend I reaffixed it to a different wall with different screws, and I'm keeping a close eye on it.

I bought a cordless drill recently. Can't imagine how I lived for all those years without making holes in the walls.