I've been running this over and over in my head. What on Earth would posses me to state I had slipped in the shower and injured myself?
I mean if I really did then I'd probably just say I had a household accident.....but then people would demand to know what.....
So that doesn't work. I can't think of an actual household accident that seems better so maybe I'd just go with the truth there.
It must be true, because if he actually was pulling a Tiger and was being chased by his wife or something you'd never say you hurt yourself showering, right? Or would you?
I guess the simplest explanation is the one that's usually true and in this case it's that he's telling the truth only it seems way too easy and somewhat bizarre.