I keep a pair of large ones in the truck that I use most often for fixing bent hinges (from the wind, common on alumnium doors)
Now that I ponder on it, I don't think I have ever used either of them on a actual bolt..
I suppose this goes under Bracket Bending tho ;P
I have used one for a door stop tho....but then, I use whatever I am not using in the tool bucket for a door stop...even tho I have 3 or 4 in the truck, the truck is 40 feet away, the bucket is next to my foot....