Well its the natural human response, isn't it, to shout something along the lines of 'shitting cunting bloody sodding BOLLOCKS!' when you suddenly stub your toe. Or worse still, what happened to me a few months back. I stepped downwards and caught my toenail against my bed. Ripped my toenail off. Or almost, it left it hanging off by just a tiny shred of tissue, had to remove it by using a pair of electrician's pliers to finish the job and rip it off completely, after first covering the raw nail bed in 20% benzocaine and covering the inside of a convenient muscle in 5ml of a warm, saturated solution of morphine sulfate plus as much oxy as I could dissolve in same.
And I'm surprised if you didn't HEAR the torrent of admittedly pretty revolting language in ASL sign language. If you heard a long and protracted string of verbal foul terminology in 5-6 different languages, interspersed with some rather black imprecations howled and shrieked in the names of some of the less desirable ancient greek deities of the kind that are somewhat explicitly NOT to be found in Olympus, more.....used to southerly climes...very..very..southern climes in fact, Any further south and you'd find yourself freezing your tits off at the north pole, and still worse things howled, shrieked and bellowed in sign language loud enough to wake the dead and the accompanying screaming horror at finding themselves reanimated but still stuck in a pine box in a 6-foot deep filled-in hole in the dirt.
If you heard something like that, followed by 'my fucking TOENAIL! jesus cunting mother of jumping shitting christ on a bastarding bike' from somewhere around the middle of the UK....mea culpa. And YOU winced? YOU did?!?
Don't know about lego, never had the pleasure. But have stood on the upturned plug of one of my mag stirrer hotplates. That was not fun whatsoever. And I'm just thankful I hadn't opened that bottle of iodine monochloride by the time I stood on the fucker. I was just about to put my shoes on, get working, then suddenly YAARRGGGGHHHBOLLOCKSOWOWOWOWOWOWOWOWOWWWOWOWOWWOW!
I think your absolutely right. It isn't as if your being offensive in such a case, its as natural as bleeding after cutting yourself, or crapping blood after eating seafood curry from an arab takeout about 6 hours later. Or being one of the poor unfortunate tudor/victorian sods to have the rotten luck to walk under the houses of somebody needing to empty their chamber pot, after the entire family of 10 had food poisoning, and as a result ending up being doused in a mixture of all three bodily ejecta, right at the very moment one happened to look upwards
Its not swearing..its the result of a few tens of millenia of human and protohuman evolution. Well not the stirrer-hotplate plug and nearly knocking over a bottle of iodine monochloride and melting my foot off; given the distinct lack of electric power supplies and interhalogens during the main portion of human evolution. But it can't be helped. Its just one of those things.
Theres no extent of chilled that will cancel out such a sudden horrible shock. Although nothing worse? I'd say having a toenail off is far, far worse than just stubbing a toe, or even stepping on a plug.