Ze Crypts of Lieberkuhn!! Watch
Cheap date: to get Drosophila to mate more effectively you feed them a bit of alcohol; if this particular gene is mutated they just fall over flat on their backs... hence cheap date...
Ken and barbie: no visible external genitalia
I HAVE to find a way to get those into my exam answers...
Just thought I had to share this purely because it made me wake up in lectures as it reminded me of this thread!
the sonic hedgehog and super sonic.