Put them in a crate until they learn their lesson. Ok, no not really. You need to cut off a finger. Ok that was another joke. Seriously, you need to just watch the video for some ideas.
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Another great post, @cerise - quite supportive for anyone experiencing this challenging situation. Comes down to Treating Others as You would want to be Treated - if you were in Their Shoes....
I think the best way to dealing with uninvited guest is to make them uncomfortable. Ask them dumb question, or as you said, ask them why they are here.
Depends on the situation. Sometimes an unexpected guest can be an opportunity for growth ;)
Thats true.