What do you do when everyone only has one type of card in their hands?

Very rarely, everyone will either not ask for the cards that other people have, or they will all be very cautious and not decide to check cards. When every person asks for a card but decides not to check when the target responds with “None of Your Business,” and no cards have been played for their effects, and no new cards have been picked up, then each person draws one card and play resumes as normal.