
When the emails start piling up, everyone needs a little stress relief at work. These fun desk toys at the PopSci Shop should help you forget the inbox overload. Plus, they’re all under $20 so they make great stocking stuffers!

Thanks to its blocky texture, this ingenious mug acts as a blank canvas for your creations. You can attach any number of building blocks, and enjoy steaming coffee in style. Some people have even fitted their mug with Lego wheels. The mug is now 50 percent off at $19.99, with four colors to choose from.

If you can’t get enough of that good old ferrofluid, here’s another option. With high-grade ferrofluid and proprietary suspension liquid, this display offers an incredible show. It’s normally $24.99, but you can order now for $19.99 with a choice of styles.

Based on the classic Walther PPK, this semi-automatic rubber band handgun lets you sharpen your aim in the office. Made from maple and walnut, it lets you shoot rubber up to 20 feet. You can grab one now for $19.99 with 50 bands included at 20 percent off MSRP.

Here’s one for when you’re working late: toy planes that shine after dark. Using the supplied slingshot, you can send your airplane right across the office. You can share the fun with a three-pack for $16.99, saving 32 percent on the regular price.