You knew you were supposed to sign the passport card at check in...but you conveniently forgot it along with the fact that your nephew no longer worked for Hampton Inns.
You tried to defraud them...you got caught simple as that and now you are ticked off because you were embarrassed in front of all those people...again because you were caught!

I imagine you will also tell your 8yr old that Hampton was wrong and you were right to try to get a cheaper price even if it means lying.