A burger and a shake - the classic companions! Mix those two and you get the Burger Shake - it may not sound very delicious, but the thought of mixing two nice things is great...or something! :)
Anyway, the Burger Shake font is about having fun in a legible way. The letters are slightly uneven and rough here and there, and has this nice handmade organic feeling. I've added 5 slightly different versions of each letter, and they automatically cycle as you type!