Jake's Joke

Overheard at our house tonight...

Jake: "Dad, what's your name?"

Me: "Jim"

Jake: "How do you spell it?"

Me: " J - I- M "

Jake: "Nope, it's...  I - T "

Jake: "ha, ha, ha"

Me:  ??? 

Jake: "Get it? How do you spell 'it' ?"

Me: :::: groan ::::