Individual income vs. government borrowing/spending are not the same thing.
Your analogy, corrected:
Today Bob's parents borrowed $100 from Alice and Bob earned $5 on his own. Bob thinks he became $5 richer, Alice is owed $100, and Bob's parents now have more debt.
Two things:
1. Bob's personal debt rose over past years too.
2. Bob's parents are the money issuers. When they decide they can't return their debt they probably make this money worth zero.
Whatever, I'm done with that thread, as HNers don't seem to approve :)
Build a graph from that data and you'll be very surprised, I guess.
1980 -- $1.3 trillion
2006 -- $12.8 trillion
[edit]: Oh, there's a graph actually: http://globalpolicy.org/images/charts/SocialEconomicPolicy/t...