clue stick
n. A metaphorical stick used to "hit" a person in an effort to remedy that person's ignorance or incompetence.
Examples
2000
Get the clue stick, quick! … Did you see the recent Openlaw coverage, in which ideas for arguments in defense of the DeCSS defendants are being collected online, so that anyone can contribute? … What earthly benefit could a legal team gain in building a case in full view of the opposing side?"
—J. S. Kelly, “Open source: It's the law,” LinuxWorld, April 01, 2000
1999
Why does the media continue to insist that Linux is 'no good for the desktop'? What needs to be done to stop this pervading image from persisting? Time, and repeated whacks upside the head with a clue stick!
—Peter Collinson, “The work of Eric S. Raymond,” EXE, April 01, 1999
1994 (earliest)
'Kate is bad.' (whack)
'Lisa is good.' (whack)
—excerpts from"Whacking Dustin with the clue stick"
—Lisa A. Helbling, “Re: ska with me…,” alt.kids-talk, March 10, 1994
Notes
The Top 10 things to say to the terminally clueless:

10. Step into the rain and let a few clue drops hit you.
9. Go to a restaurant and order something off the clue menu.
8. Open up a book and read a clue chapter
7. Step on the elevator and get off at the clue floor
6. Pick up the clue phone.
5. Buy a ticket on the clue train.
4. Hit the road and go to the clue outlet mall.
3. Take a dip in the clue end of the pool.
2. Make like a detective and find a clue
1. Take a hike in the clue forest.
—“Send a movie executive to clue camp,” The Orlando Sentinel, October 21, 1994
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