There was a post here a while ago about s.o. coming to the US on a tourist visa asking to do volunteer work in return for a place to stay. I'm just curious if y

There was a post here a while ago about s.o. coming to the US on a tourist visa asking to do volunteer work in return for a place to stay. I'm just curious if you've ever dealt with similar cases, where people came into the country with the wrong visa, found a place to live/work, but then had to get their papers sorted out to be able to stay? Were they actually able to stay or did they have to go back and apply from outside the country (US) again? And more of a personal anecdote than a question, but during my own immigration process I've noticed that there appear to be mostly people who are either extremely over-prepared (have all the documents filled out in advance with additional papers/proofs/documents for every single step), or they are not prepared at all. My fondest memory was a man walking into the embassy asking to immigrate right now. No papers, documents, nothing. Just walked in, went to the clerk's window and asked to immigrate today. Even the clerk was a bit dumbfounded by the demand.