You'd be surprised just how much Doctor Who and Red Dwarf have in common.
Check out this link http://www.reddwarf.co.uk/news/2013/11/22/doctor-dwarf/
I'm kicking myself not realizing most of them, especially the one about actors Simon Day and Yasmin Bannerman.
Lister: Knock Knock
The Doctor: Who's There ?
Lister: Doctor !
The Doctor: Doctor Who ?
Lister: EXACTLY . . . . . . Happy 50th Anniversary ya 900 year old Smegger !!!!.