Mr. Bean is Autistic
He shows all the signs of autism, first and formost, problems with social skills.
Mr. Bean is actually an alien or fallen angel.
Which is why the opening shows him falling out of the sky in a beam of light, then blundering around, confused - to the musical accompaniment of soft Latin chanting. His odd behavior is actually a result of him not being human and not really understanding how humans are supposed to behave.
- The Animated Series went with the Alien route, where Mr. Bean is abducted by a UFO all full of identical replicas of himself.
- Alternatively, Mr. Bean was an ordinary man, abducted by aliens and subjected to mind-altering experiments, and later returned back to Earth.
Mr. Bean is a descendent of Sawney Beane.
Better hope that he is not cannibalistic.
Mr. Bean is the Black...Vegetable.
Another Blackadder descendent.
Mr. Bean and Teddy are symbiotic to each other.
Explains how he treats Teddy like a real person so much.
Mr. Bean is Johnny English
After going on his missions, the MI-5
retired Johnny English and brainwashed him into believing him to be Mr. Bean - the most incompetent man in the world. Not surprising since the two act very similar, although Mr. Bean can't speak that well.
Mr. Bean PLAYS Johnny English
That would explain the scene with the Queen at the premiere.
Mr. Bean is the way he is because his wife and son died.
He once had a wife who died while giving birth to his son, and then his son died at a very young age. Mr. Bean is such an odd man child for two reasons: incredible loneliness, heartbreak, and he's trying to imagine what his son's life could've been like.
Mr. Bean is a reality show
The blue car belongs to the filming crew.
Dr. Peggit, the dentist, is the driver of the Blue Reliant
We see it parked right outside his office.
Mr. Bean's new mini
After his mini is crushed by a tank, he takes the one that he moved at the beginning of the episode. It explains why he's still driving it in later episodes.
Irma Gobb knows she's a fictional character in a sitcom
She's at least aware of the show's Negative Continuity. She goes out with Bean just to humiliate him when he gets it wrong, knowing he'll forget by the next episode.
- Or the order of the episodes simply isn't chronological, or she knows he has memory problems, or that he is a very forgiving person.