[Desdemona]

Mirror, Mirror
on the wall,
Who has the flakiest theory
of them all?

[Dataman]

Mirror, Mirror 
on the wall, 
Who has the flakiest theory 
of them all?

Isn't it just a bit arrogant to start explaining the nature of something that does not exist (dark matter) by introducing something else that does not exist (mirror matter)? It is, but that has never stopped junk science before.