Here's another cute logic puzzle. The site I got it from offers a solution, thus no link yet.
The task is to answer the following five questions correctly. Each comes with one correct and three false possible answers.
Q1. What is the lowest-numbered question with B as correct answer? A) Q1, B) Q4, C) Q3, or D) Q2.
Q2. What is the answer to question Q4? A) answer D, B) answer A, C) answer B, or D) answer C.
Q3. What is the answer to question Q1? A) answer D, B) answer C, C) answer B, or D) answer A.
Q4. How many questions have D as their correct answer? A) three, B) two, C) one, or D) none.
Q5. How many questions have B as their correct answer? A) none, B) two, C) three, or D) one.
The same site regularly runs quizzes with psychological contests, e.g. "From the numbers 1 through 100, choose a number. You win if you choose the lowest number which no other participant has chosen." Others call for most popular answers similar to Family Feud, e.g., name a dinosaur which as many other participants as possible will also name. I feel inclined to run a couple of such questions on the Lemmings Forums, getting answers via PM, and revealing the results after 3-6 days. Are people interested in such things? (Name a useless L2 skill other than Diver *grin*)
-- Simon