They where arguing over regeneratingThe first nine felt it was a change in perspective. Ten saw it as death
All ten doctors are Time LordsC'mon, someone had to say it.
9 out of ten doctors agree that none of them are time lords
The one doctor who doesn't agree is right.
The nine doctors that are agreeing are talking about sixth's coat.
So what does the eleventh do?
The 10th doctor's a prickHe knows that the other 9 are right, he just likes to disagree.
The 10th doctor is from Bizarro World
The 10th doctor got hit in the head and fell on the "no" button by mistake.They showed it in a Trident commercial, it must be true! (though they had 4 out of 5)
The 10th doctor is a Ph.D.See, for instance, "Dr." Gillian McKeith.
All the doctors are the original 10 doctors in Doctor Who.To go with the above theory about how they're Time Lords.
The 10th doctor doesn't really believe what he saysThe other 9 hate him and are just disagreeing out of spite. So #10 has started proposing leeches, blood-letting, and cocaine for everything so that the other 9 will go disagree and pick the smart alternative.
3 out of 11 Doctors Agree: Bowties are Cool
...that this really isn't their field of studyThey just kinda hoped you wouldn't press the issue.
The "tenth" doctor is actually the sixth.The Colin Baker Doctor seems the most likely to be contrarian to his other selves just for the sake of it. After all, he wore the coat just to piss people off.