Had a major problem with a curtain rail holder being pulled out of the wall, the screw and rawplug leaving a gap in the plasterboard about  1" diameter. I was looking at going to buy some filler when I remembered Gorilla Glue.

Mixed some up, waited for it to start foaming then stuffed it in the hole with some selotape to keep it from running out, pushed in a new rawplug while still wet and waited for it to dry.

Removed tape, did a little sanding to level, then screwed in the curtain rail holder and painted. Good to go!