Using an unsharpened pencil is pointless. Making a grid crosses a line. Finding ways to better manipulate your ruler can be seen as act of treachery.
Serious question: If a pun is the use of a word in a sentence that can have multiple meanings, is using a word that is similar to another but doesn't give the sentence another meaning truly a pun or is just a play on words?
Pun: I was going to make a pun about ice but I slipped up and couldn't get back on track.
Slipped (falling on the ice or a mistake) and Track (traction between one's feet/shoes and the ice or a specific direction)
Other: Snowing you some ice.
Snowing (taking the place of showing)