If you're like me, you still haven't gotten over Snape's heartbreaking death in "The Deathly Hallows."
Snape, one the greatest double agents in literary history, was actually good all along and really, really, really wanted to bang Harry Potter's dead mom (while she was alive).
It is of course Snape's memories he imparts to Harry that give Harry the terrible realization he is the last horcrux that needs to be destroyed.
Find someone who looks at you the way Severus Snape looks at Harry Potter's eyes.
But what if I told you Snape might not have actually died?
My theory is that Snape didn't die at the end of the seventh book, based on two points. 1: Snape doesn't appear when Harry uses the resurrection stone: You'd think Snape was very important to Harry, he loved his mother, gave his life to save him, and shielded him all his life. Harry just found out how Snape had been protecting him the whole time and died to save him, so when he used the magic ring that brings the spirits of dead people, you'd think Snape would be there. He certainly knew Snape longer than Lupin, and you'd think Snape was far more important to him than Lupin, but Snape wasn't around. Perhaps he was not dead.
Yeah, why didn't Snape appear when Harry used the Resurrection Stone. Harry's son Albus Severus was given Snape's name because he was the bravest man Harry ever knew.
Clearly, the absence of his ghost is a little suspect.
The second part of theory delves into the forensics of Snape's death, namely: Where in the wizarding world is Snape's body?
2: Snape's corpse isn't found or mentioned: After the big battle, they lay out all the bodies, all the people who died, even the death eaters and Voldemort's. Harry sees Lupin's and Fred's body, but Snape's body isn't there. You'd think Harry would have told everyone about Snape's sacrifice so they can find his body too. But nope, Snape's corpse isn't found.
And why was there no corpse? Because Nagini's bite didn't kill Snape (according to the theory).
CAN SOMEONE JUST QUICKLY CHECK HIS PULSE?!
Just think about it, do you really think a POTIONS MASTER wouldn't have access to anti-venom? You think he wouldn't have prepared for the possibility that Voldemort's snake might turn on him? He was playing a dangerous role as a spy, Voldemort could turn on him at any moment, I think Snape would have obviously taken some kind of prophylactic antidote beforehand.
Side note: DER_GOTTKAISER's mention of "prophylactic antidote" makes me wonder what kind of birth control they have in the magical world.
I'll even go further to say Snape probably knew he'd be targeted by Voldemort as the true owner of the Elder Wand (even though the wand's power passed from Draco to Harry).
As a wizard and a double agent, Snape was always extremely prepared, which gives credence to DER_GOTTKAISER's notion that Snape is alive and well and probably traveling "the world and living his own adventures."