Overheard at Table 4: IDK

Dad: What does IDK mean

Son: I don't know.

Dad: Well then who would?

Son: That's what it means, Dad, IDK.  I. Don't. Know.

Dad: See, now was that so hard?

Son: Geez Dad, WTF

Dad: What does that mean?

Son: Nevermind.

Dad: Well WTF to you too then!