This is a fun project, I was watching The Tick and he had to arm wrestle a robot in one of the episodes, he won.
I was picturing two robotic arms each with an ELK, fans can bet on the winner using a smart contract.
The contenders use their smart phone and either tap, swipe, solve puzzles, or some kind of competition while each arm struggle against each other based on who is doing better in the challenges until a winner prevails. This could be a contest at the battle bots challenges.
They also have arcade games where a person arm wrestles a robotic arm, using the ELK you can have bets and competitions with man vs machine.
There is also the claw machines in malls, where you grab a prize with a grappling claw, it looks like it could be powered by the ELK and accept ETH tokens.
A Decent Dart Board or Decent Pool Table at bars could also be a great betting/competition use case for the ELK.