If I’m on my deathbed, will I regret the fact that I haven’t collected all the badges on Foursquare? Will I pine for more exciting and delightful user experiences? That’s the ultimate test. You want a design challenge? Design things people won’t regret doing when they are on their deathbed and design things people will wish they did more of when they are on their deathbed. Design things that one’s relatives will look back in fifty years and express sympathy for. Again, when you are dead, will your kids give a shit about your Foursquare badges?