iron man, the song this time

the other day Z comes home singing "ta na nanana tanana" ok, forgive me because i don't know how to write it out in a way that you can get it, but he was humming iron man, well enough for me to recognize it. so i waited around a bit, then he finally sang the words "i am iron man, am i dead or alive?"...with a little adlibbing.

he said he was told not to sing it (but he still was)