I have not yet heard anything as egregious as, “Me went to the theatre last night; a friend gave I the ticket.”  But it will happen.  It is already as common to hear an assertion that something “cannot be underestimated” (when stressing the importance of something) as it is to hear the correct usage.

If this sort of thing makes you stroppy too, I recommend the list of 51 commonly misused words that I found in the Sydney Morning Herald.