A slip of the Freudian tongue

I had the students in my class conduct a scavenger hunt of sorts on covalent compounds in the class room. There are clues and questions on the worksheet and the answers are taped around the room, answer side down. The kids seem to enjoy this as it invovles movement along with their minds working, along with a little socialization.
There were questions like find 4 objects in this room that are covalent compounds (any thing with water, paper, or wood)
Some of the "answers" are duds and say
"I am not a clue"

One of my students, a sweet girl, comes up to me yesterday and wants to know why her sign says
" I don't have a clue"

Heh, been chuckling over that all evening.