I am a building contractor and along the way I have run into my share of guys who can't read a tape. Once I found that out, I needed to have a little fun
Example:
Me: Hey nitwit, I need you to cut a 2x4 cut 15 and 16/16ths long.
Nitwit: How long (pulling out tape)?
Me: 15 and 16/16ths.
Nitwit: (again) how long?
Me: 15 and 16/16ths
Nitwit: (stretching out tape and visibly counting the lines) 16/16ths?
Me: Yep, need it right away
Nitwit: (still trying to count lines) Okay boss, coming right up (still counting lines)
Me: Got that cut yet?
Nitwit: Hey.....my tape don't go that high
Me: Sure it does, it is 16/16th less than 17 inches
Nitwit: Well my tape is differnt than yours.
Me:
you nitwit, it is 16 inches.