Don't worry, my boys are wearing their Superman underwear today. So far I have been only letting them jump off the couch to fly, even though they think it would be better training to let them jump off the roof. I will go let them now, it is afterall for the good of mankind, or at least their feelings (in the short term.)
Superman doesn't fly anymore. He's now just a computer cartoon, so if they want to be "Superman", then they should learn to program computers < /sarc >