Everyone knows that ADnD dice are from a different universe
and don't follow the law of probability. I, for instance, own
a set of dice that just know when to waste the high rolls,
and that roll low when you really don't want a low roll.
I've had one character that probably has inflicted more damage
to party members than to opponents (and not on purpose - my
current character on the other hand....). Like the time my dwarf
was 20 yards away from a fight between the thief in our party
and a nearly dead nasty. So, the dwarf decides to shoot a
cross-bolt. Right.... The attack roll (on a d20) was 1, fumble. Roll again, another 1. So I hit the thief. Roll again, this time a 20, so it's going to be a critical hit.
Roll for damage: a 10 on a d10. Poor thief, she hadn't lost
a single hp in the fight so far, but now she was on death's
door step, with an arrow between her shoulder blades.
But when I fight a lonely kobold, with 1 hp left and no
armour, it's garanteed I'll roll a 20.