Grandstander: A friendly variable font by Tyler Finck 

And it is super friendly—at thinner weights it’s a zany Comic Sans alternative, at thicker weights it’s more like a sign painting font. It seems perfect for your kid’s next birthday or all your passive-aggressive office signage needs. It’s open source (under the SIL Open Font License), has variable weight and slant axes, and it’s available on Google Fonts. (Found via Mark Boulton’s type specimens newsletter.)