Sorry, I'm not willing to throw verisimilitude out the window entirely. As I said earlier, I have not yet run up against a case where the rules clash with verisimilitude, but in the event that it happens, I consider it unacceptable to fall back on "The rules say so." I don't think it's okay for me as DM to tell the players "The rules say so" when they complain that my narrative doesn't make sense, and to some extent that standard applies to them as well.
Somebody needs to come up with an explanation when the rules do wonky stuff, and I think it's only fair that the burden should fall on the person invoking the rule.
Of course, I'd probably help out. I'm pretty good at justifying wonky rules results, and my goal is not to slap down the player - it's to create a sense of internal consistency about the game world. And if nobody at the table can come up with a way to make the rules result believable, I'll allow the player to retcon his character's actions (since the character would have known that what he was trying wasn't possible).