My weirdest ever fancy was the bloke who played Joe Mangel in Neighbours, but not while he was in Neighbours, years afterwards, when I saw him in a one man show in the theatre.
Mark Little (who is actually very big, well built and well over 6ft). Seeing him live, I found myself fancying the arse off him. I've always liked big blokes, so maybe it was that, I dunno, but fancy him I did. 
The crush lasted quite a few years. He'd occasionally pop up on the telly - Buzzcocks, the Wright Stuff, Emmerdale. I've just been looking at old videos of him on youtube and the fancy has gone completely, but for a long time I had quite a thing for him.