Stone.
Because they were for test porpoise only
A gun free zone
Because 5 was a Registered Six Offender. Edit: a word.
I said, "I Excel at it." He replied, "Was that a Microsoft Office pun " I was like, "Word."
Because they were set in stone.
Because it's stoned.
A letter of marque(https://en.wikipedia.org/wiki/Letterofmarque).
I.O.U.