Don't be fooled by the above photograph. Ice cream has a dark side. And I'm not talking about the side effects of eating it whilst simultaneously drinking cups of blisteringly hot tea - a pastime reserved for lunatics and nutjobs. No, ice cream can be sinister. And if you don't believe me take a look at this clip from Bill Forsyth's Comfort and Joy. Warning: contains moderate Scottish accents and mild peril. Not to mention