Interresting and funny at the same time here.
In case you want to swear to somebody to trust you when talking to them, just avoid this one and dont ever swear in this kind of aituation.
Concerning shit and other ones, just do it and make sure it is only the concerned who heard you not some others around.
Usually people do a fine job of making themselves look stupid without having to point it out.. I don't want to become a "puritan" - im hoping for reduction more than total success.. We'll see.