For those who want to play a prank on the resident office cleaner, the Funny Spilled Ketchup Design Mouse Pad Mat is perfect, although the $11.99 price point might be a wee bit steep for a regular mouse pad. The design itself is self-explanatory, although it might not be suitable for those who are used to the standard rectangular design of most mouse mats. At least it comes with a rubber non-slip backing for better mouse control.