Infection
Until you get infected, you don't know which type of superpower you'll receive. The virus comes up with new ones all the time: You might turn microscopic and travel by jumping from raindrop to raindrop; you could control various spectra of light; perhaps you’ll develop a carapace of aerospace-grade titanium; you may develop the ability to revive small animals with a touch. Recently, there’s been a growing phenomenon of people barricading themselves in underground bunkers; so far they’ve been able to evade infection. But what sort of ungrateful wretch would want to remain average? Some people are just never happy.