Well, if it's linoleum, they'd just bounce. Ceramic tile on the other hand...
Ouch...
Though Dad has me paranoid about those now. They just redid the whole downstairs in ceramic tile - looks really nice. But he's vey nervous that someone will drop something and crack the tiles.
Even in my sleep I'd probably be careful only to drop a child on a soft part...say their rear end... ;-)
In reality, the tiles are probably a lot tougher than he thinks, but that's Dad for ya!