am i normal?

I was in the stationers today, waiting to pay for my Pritt stick (which makes me sound like I buy lots of them, which I don't). By the cash desk was a pot of enticing silver- and gold-ink pens and a pad next to them to 'try before you buy' (please excuse the inverted commas and brackets, I can't help myself). As I stood queueing I was overcome by a sudden urge to start writing filthy swear words on the pad in lovely metallic pen. I drifted off in a reverie of obscenity before the man behind the counter informed me 'only £2.99 innit'. I didn't buy one. Or scribble any incriminating rantings.
Obscenities used to figure on my Tube journey to work too. If I'd had enough of my book/Metro/Sunday supplement that I still hadn't got round to read by Thursday, I'd have a 'swear break'. This consisted of looking around the carriage and thinking of the rudest/vilest/most horrible things I could say to each person. My comments were usually based on physical attributes. I'm sure you can imagine. I used to counter this, and the potential damage it might do to my karma/aura/chances of getting into heaven/face if I forget myself and start saying things out loud, by having a 'love break' where I'd look round the carriage and think of the nicest thing I could say to everyone. Worryingly I found this much harder!
You'd never guess by looking at me that there's such a foul-mouthed monster dying to get out.