Getting a mini-stapler has added so much joy and happiness to my life.
A mini is small enough to fit in my purse, so I always have a stapler when I need one (which is often, as I'm a college student). The Swingline Tot Mini Stapler cost me less than $2, and now I'm going to wax poetic about its ingenious design. First, it uses normal-sized staples instead of those silly mini-staples that other mini-staplers use. Also, it's ergonomically-designed, with grooves on top and bottom for a thumb and forefinger to grip and staple. There's even a small staple-remover built into the bottom.
It's the simple things that make me happy.