Are You 4-Real?

The Boss : "How do you spell 'twelfth'?"

Here's me : "T-W-E-L-F-T-H"

The Boss : "No, when you're writing it down."

Here's me :"Ehwha? Same way, I'm pretty sure?"

The Boss : "No, I mean when you're writing it down just a number 12 with a t-h after it."

Here's me : "I think you may already know."

The Boss : "Yes but is there an 'F' in it?"