Undisclosed Side Effects of the Haste Spell

d12
1. Instant haste addiction: can't stop thinking about how awesome it was, inclined to beg, borrow, steal, make nuisance of self, just to taste that sweet speedy sensation again
2. Following spell duration, subjected to sudden uncontrollable twitches, tics, and a debilitating stutter for 1d12 turns, -2 to everything, spell casting impossible
3. Mild heart attack: character sweats profusely, feels disturbing chest pressure, able to convince self its only indigestion, back in action after 1d6 turns, save vs. fatal infarction if ever again hasted
4. Mini-stroke: character must lie down for 1d6 turns, certain its just a passing spell, but then believes self to be alright, save vs. lethal brain hemorrhage if ever again hasted
5. Life-threatening nose bleed: slow to clot, supernaturally profuse, must be firmly compressed with hand for 1d6 turns or risk bleeding to death
6. Effects of concussion from speed-jostled brains, future degenerative neurological condition assured
7. Post-haste mental effects similar to coming out of anesthesia, delirium, hysterical laughter, sudden weeping, suggestibility for 1d6 turns of role playing excitement
8. Continues to talk at double speed/pitch for the duration of game session
9. Slow spell effect for a period equal to that of the hasting
10. One full round of supremely violent vomiting instantly upon inception of spell duration
11. If you thought the sweat of fear smelled bad, brace yourself for that singular haste stank, predatory monsters can smell it a mile off
12. Drop stone dead on your birthday in 1d12 years time