If there's any instrument that perfectly fits with Pinkie Pie's anthem, Smile Smile Smile, it's the ukulele. The uke is just such a bright, happy instrument. It makes you want to smile.
ChuckinBrony must think so, too, because he did a great cover of Smile on the ukulele. Give it a listen—it sounds fantastic! It's just the thing to put a smile on your face, no matter what.
Thanks for sharing, ChuckinBrony!