The best cheating I ever saw in highschool/university was:
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written on the brim of a hat sitting on the table. Guy would "fiddle" with it while "thinking hard".
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guy peeled off a water bottle label, wrote on it, and stuck it back. You could read the notes through the bottle, but they were faint enough it wasn't too obvious waking by.
I like the native wheel with the pride maple leaf and Canada goose.
Also, way too many My Little Ponies lol