SpongeBob PuzzlePants

a.k.a. SpongeBob Cube
Burger King promotional item, 2004.
(plastic, 2.5 inches)

An easy but fun puzzle where the top and bottom halves can be rotated with respect to each other and a piece can be slid up and down. Jaap's Page observes that this puzzle is like a 2 high by 4 column Whipit Tower where all pieces are different (or similar to a small Babylon Tower), and presents a solution.

Further Reading
Jaap's Page, from: http://www.jaapsch.net/puzzles/spongebob.htm