I don't know if I have told the story about the liquid nail on here before.
We bought several safes from a chain of defunct hardware stores. One of these stores had a drop safe where they had built it into the wall, half of it sticking out on either side. The drop compartment was on the outside, and the safe door was inside the cash room. Since they were tearing the building down, damage was not a concern. We sawed the wall from around the safe, and as we tore it apart, realized that they had simply liquid nailed the wood studs directly to the safe.
After getting the wall out of the way, we opened up the safe to unbolt it. To our surprise, there were no bolts, yet the safe wouldn't budge. We put blocks against it and hit it with a sledge. We put a johnson bar under the hinge and stood on it. It wouldn't move. I finally brought in our forklift. We pressed againt it gently, and the forklift spun its wheels. I bumped into it with a bit more force, and it finally popped loose. Actually, it didn't pop loose. The glue holding the commercial vinyl tile to the floor gave way. The tile was still glued securely to the safe. Upon close inspection, we determined that it was the same liquid nail. It made a heck of of a bond between the steel and the vinyl tile.