If you're nailing or screwing into the exterior wood of a house, again, just stop. Do you really need to put screws in to hang your fucking garden party lights? No, I don't think you do. But if you insist, fucking caulk them or something so you aren't just piercing the waterproof skin and providing no protection.
If you're cutting a hole all the way through a roof or a wall to put a vent, fucking stop for a second and make sure you're doing it in the right place, make it level and centered.
You can't fucking undo these things.