Githyanki, 3rd ed.
Githyanki got telekinesis as a 16th level sorcerer (and were ECL +2 IIRC), and telekinesis could throw 50lb/level. Weapons did damage as weapons, not by weight. Arrows are not very heavy, so the character could throw thousands of them. The player got the whole party to wear a quiver of arrows on their back. The first round of combat, he launched all of them. Individual arrows had little chance of hitting, but a 20 automatically hits. Ludicrous damage resulted. The player started talking about using a cart to carry even more arrows, but before that happened the game broke up due to everyone else feeling utterly insignificant.
8th level Wizard/Alienist, 3.5 ed
The pseudonatural template (applied to all the Alienist's summons) gives a creature true strike 1/day. Using Summon Monster 4, 1d4+1 psuedonatural giant bees are summoned. Giant Bees die when they strike, but their stings do significant constitution damage.