"If vegetarians eat vegetables, what" joke

If vegetarians eat vegetables, what do humanitarians eat?
Don't think that you're thinking. If you think that you're thinking you only think that you're thinking.
When I erase a word with a pencil, where does it go?
If a train station is where a train stops, what is a workstation?
Why is it, when a door is open it's ajar, but when a jar is open, it's not adoor?

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