I am not one of those people who does something just because it is illegal or socially not accepted. Nor do I like provocation for provocation’s sake. But of the many things that I like to do, some include activities that overstep the boundaries of the social norm a bit; just to show that I am an individual and not merely an exchangeable member of society.
For example, I take off my shoes when I am in a library. (Not because I regard libraries as sacred places, but because it’s comfortable.) Or I read a book when I am in a concert of classical music because I can listen and read at the same time. Or I give up my job from one day to the next to become a student again. Also, I like to talk back to people who speak into their mobile phones so loudly that I can reasonably claim that I thought they were addressing me.
If you want to experience the feeling of breaking a taboo, I recommend that you start with what is the biggest taboo for most people: their children.
When travelling on public transport, I sometimes do the following: If there is a baby around whose physiognomy warrants it, I look at the baby for more than the normal duration of a stare, frown and state with a clearly audible voice “What an ugly baby.” Not in an aggressive way, just as a declaration of fact, before turning to my newspaper again.
Let me know how it went.