My neighbor called me over to watch the contractors he hired demo his kitchen tile. He was having the kitchen re-tiled because so many of his tiles had broken, and the grout had cracked and crumbled out of all of the joints. It was in horrible shape. Apparently, the previous homeowner had put this "new floor" in right before selling the house.
Well, I was there when they started tearing up the tiles, and you would not believe it, but they had used LIQUID NAILS to glue the tiles down to the subfloor. NO THINSET! The tiles had almost zero coverage, and came up so easy in most places that you could simply pick them off of the floor by hand.
I just had to take pictures (and a video) and post here for your amusement.
Much to my delight, the contractors who did his floor at least used modified thinset. Why he didn't use liquid nails I don't know, seems to do the trick...
Youtube video of how easy the tile came up here:http://www.youtube.com/watch?v=QG-AFYAyJIQ