Ok...attempt this one if not already tried. It's a good one.
"There are 5 caps in a box: 3 black and 2 blue. A, B, and C pick one cap each. A can see what B and C are wearing. B can see what C is wearing, but C can't see any. When asked about the color of the cap, A didn't know. When asked, B didn't know. When questioned, C told the correct color. How?"
Thanks & Regards,
Kavita