The bogey

This is the conversation recently had between me and boy in the car...

"Mummy, I got a bogey."
"Thats nice, is it a big squishy one?"
"Yes Mummy, and crispy, Im going to eat it"
"Eurgh no."
"Why NOT Mummy!"
"Because its disgusting."
".. I'm going to eat it..."
"No, don't eat it."
"Why not?"
"Please don't eat it."
"WHY NOT! I WIPE IT ON WINDOW INSTEAD MUMMY!"
"No."

Silence... I know that this means he has wiped it on the window.

..."I did it Mummy."
"I told you not to."
"Why not? I put it on window."
I turn to see but there is no bogey, just a trail where it had been smeared up the glass.
"Where is it then?"
"Oh, I licked it off and eat it Mummy."

Delightful.