Ok, I'm not saying go buy all these instantly but this lot are good ad major, plus they'll keep you reading for ages:
1. Batman: Year One (psychological and gritty)
2. Batman: Year Two. (the coolest bad guy EVER)
3. Batman Chronicles: The Gauntlet (Robin becomes robin...)
4. Ten Nights of the Beast (Jason Todd is Robin now. Cool bad guy!)
5. The Killing Joke (Batgirl gets crippled. Dark and major!)
6. a Death in the Family (it isn't brill but I enjoyed it. PS. Of course Willis Todd knew some shady guys, he worked for 2 Face after all, though the Shiva thing is ridiculous!)
7. A Lonely Place of Dying (the third Robin)
8. Sword of Azrael. (introduces such a cool anti- hero)
9. Knightfall pt 1: broken Bat (the title says it all!)
10. Knighfall pt2: Who Rules the Knight? (wow. Awesome Azbat!)
11. Knightsend (Bruce vs Azrael in the best climax ever!)
12. Prodigal (Nightwing stands in as Bruce goes away. 10/10!)
13. Contagion. (a virus ruins Gotham)
14. Legacy (the virus is advanced by Ra's al Ghul)!
15. Cataclysm (a quake rocks Gotham!)
16. No Mans Land. (theres 5 different volumes. Post quake. BRILL)
17. Evolution. (Gotham rebuilt)
18. Officer Down. (Gordon shot!)
19. War Drums. (prelude to Games)
20. War Games. (3 acts in series. A massive gang war!)
CURRENTLY UNFOLDING...
The "Infinite Crisis" saga as the DCU is entirely affected!
And I hope you don't want more!!! LOL
I recommend reading some Green Lantern... Emerald Dawn, New Dawn, Baptism of Fire, power of Ion and maybe Traitor, they're cool... oh, and Zero Hour, (that's like a thing where the DCU gets scrubbed clean!) is dawn cool...
It's a Batman Comic called "It's Joker Time", and the reason I list it is because it actually goes into the Joker's childhood, and his broken relationship with his mother. Apparently she chose a boyfriend over him, a boyfriend that would slap the Joker around and mistreat him. When the Joker accidentally killed her boyfriend with a fatal hand-buzzer as a joke, his mother turned on the Joker and actually tried to shoot him a shotgun. The comic leaves the impression though that it might be another warped perception that somehow is a reality in the joker's mind.