Old dark houses and mad doctors - what more do you want? OK, you can have two strip technicolor as well. Dated, obviously, but good fun.
It is very important to note that, due to disputes between Warner and Technicolor, this film was filmed twice, once in Technicolor and once in B&W with different cinematographers. Regardless of Wikipedia's claims that "most takes are the same," this is not the case, and they should really be considered two separate films. Also Wikipedia should not be regarded as a very authorative source, but that's another story. . .Ironically, the Technicolor version is the one usually encountered today, while the B&W version is difficult (though not impossible) to find.