(Bringing this to the forum from Slack.)
Last one: you get a small round slice of citrus (lime will do), a small dinner plate with a quarter inch of water in it, a large wine glass, three pennies, and a box of matches. You can't move the plate at all, once it's set on the table and filled with the water. You've got to get all of the water off the plate and into the wine glass. An elegant solution uses all the items. Have fun!