My twin brother and our friends and I would send each other bets that we were taking on football and basketball games. We were slowly turning this into a competition to see who knew more, so we created Betwithfriends.io.
We both have our computer science degrees but he is an extremely knowledgeable programmer since he's made a few apps before this. Jason (my twin brother) took the lead on programming and I helped out in any way that I could, mocking up the UI, gathering feedback, and starting to create a buzz around our future product.