One time I took one of my presents into the bathroom and unwrapped it.. my mother heard the rustle and said "what ze hellz are you doing in there Fritz?"
One other time my parents forgot to "hide" the plastic bag with a few of the presents in it.. I just had to look inside.

This year I didn’t have to do anything (

), my mother asked me "oooh, you would not happen to know how Ratchet and Clank 2 looks in the box would you?
- Yes, why do you ask?
-Oh no, no reason.."