Sideshow Bob and the other Simpsons characters belong to Matt Groening. I'm just a big fan of Bob.
Tomorrow, and tomorrow, and tomorrow
Creeps in this petty place from day to day
To the last syllable of recorded time.
And all our yesterdays have lighted fools
The way to dusty death. Out, out brief candle
Life's but a walking shadow, a poor player
That struts and frets his hour upon the stage,
And then is heard no more. It is a tale
Told by an idiot, full of sound and fury
Signifying nothing.
-Macbeth, Act 5, Scene 5
Robert "Sideshow Bob" Terwilliger kept repeating this over and over in his head as he sat alone in his cell. He'd seen Macbeth for the first time when he was four; his mother, celebrated Shakespearean actress Dame Judith Underdunk, had played Lady Macbeth. Most four-year-olds would have fidgeted and fussed or fallen asleep while watching a Shakespeare play, the Bard's poetry being gibberish to the ears of a child too young to appreciate it, but little Bob (or "Bobby", as he'd been called then) had been fascinated. That might have explained why Bob turned out the way he did.
Bob wondered where his mother was now. He remembered being arrested, alongside his parents, brother, wife, and son, after their attempt to cremate Bart alive, and then the next thing he knew, he was in a straight-jacket in a corner of an empty cell. Bob had learned that Cecil and their father had been transferred to another prison. The guard had laughed as he told Bob that his father and brother had found his maniacal laughter, ranting and raving to be so irritating that they had begged to be moved away from him. Bob had also learned that Francesca and Gino had been deported back to Italy, as they and Bob had come to America illegally. Francesca hadn't written to him at all. Dame Judith had been released, as her only crime had been disguising herself as a policewoman guarding Cecil, but no one knew where she'd gone after that.
Bob felt so very alone. He had no family, no friends, no future, no purpose. Both of his attempts to redeem himself had been ruined by Chief Wiggum and the Simpsons, respectively. He'd get his revenge on all six of them, someday. It was the closest thing Bob had to a purpose in the wretched "walking shadow" he called his life.