Re: Whirlybird (New Feat 3.5)
...There aren't any actual Critical Fumble rules in 3.5.
They are actively one of the worst things ever.
Never, ever, EVER muse "out loud" about how Crit Fumbles would affect a given feat, especially one like this one, which is pretty obviously not for a serious game.
Why shouldn't you?
Because damn it, you're giving bad DMs ideas. And that is never a good thing.
Because, you know what? Auto-missing is already bad enough. Making a warrior drop their weapon because apparently they have the coordination of a drunken corpse is literally just kicking a man in the nuts after you punch him in the face.
tl;dr: Critical Fumbles are a house rule at best; the only effect for rolling a 1 on an attack roll is a miss.