Lateral thinking puzzles!
I *love* lateral thinking puzzles! I've spent some time trying to teach my kids these really neat ideas.
In answer to your question, the maid was the murderer - you can't get the mail on Sunday.
And frost forms on the inside of a window - you can't wipe it away from the outside.
Finally, I think the answer to the last one would be dying or death (the only thing left after you die is your death, literally speaking). But one can touch death (ie, something else that is dead), so perhaps that's not the solution.
Best wishes,
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