Stormonu
NeoGrognard
Most fumble tables for ranged weapons I've seen from others usually end with the arrow in some ally's back and rarely have a direct affect applied to the attacker. I use a rule that generally ends in bad results for the ranged attacker, and "firing into melee" has a different rule for determining if an unexpected target is hit (generally, disadvantage to the attack, if the lower roll is a miss and the higher roll would hit an AC, it's hit a random target other than the one you were aiming at).Level drain, item destruction on failed save, and system shock-resurrection checks are all in my game, but not as house rules: they came in the tin with the rest of the game.
Probably the harshest actual house rule I have is that I make casters roll to aim or place their AoE spells; which means yes, those spells can be fumbled. We do have crits and fumbles on nat 20 and nat 1 respectively, but both need a bespoke confirm roll which reduces the frequency considerably.
@Stormonu - why would fumbles not apply to ranged combat? I mean, sometimes bowstrings can snap, missiles of any kind can hit an ally rather than a foe, the shooter or thrower can wrench a thumb in the process, etc.
Also, I've been annoyed enough times by super-accurate attempts to place AOE's that it's standard practice to require a skill roll to place things so precisely (the scatter diagram gets a lot of use...).