I see someone's already quoted Begbie. Probably one of my favourite film characters ever. Some of his lines are class. My favourite is when they are talking about drugs and Begbie says:
"Fukin chemicals? No way would ah poison ma body wi that shite."
Just at that he takes a draw of his fag and downs his pint or was it a half? Can't remember. Remember laughing my head off at it tho. Totally contradicts himself.
Brilliant!
SMG