Well, let me see, what most of my friends consider foul (but I absolutely adore) is Sushi.
I knew a guy that was dared to eat a vole bone from an owl pellet for 6-10 dollars. he crunched it a few times and down it went.
as the DW is saying at the moment "hell you drink lemon juice what could be worse?"
The most offensive thing I've had in my mouth was the X I did when I was younger, had to chew it up BLEH!

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-Seems we got here just in the nick of time. Whats that make us?
--Big damn heros Sir.
-Ain't we just.