It's as simple as that.
Your "sorry, no cash" excuse for struggling baristas may soon be invalidated by DipJar, a tip jar with a slot for debit or credit cards. Ryder Kessler invented the jar in an attempt to help out the sullen masses who create your hard earned lattes every morning. Just dip your card in and the jar does the rest. The success of the glorified tip jar exists in its similarities -- it's still just a jar sitting where a jar would sit -- and its novelty.
Spotted on: HUH.