Yeah my mothers like this. She has given me exactly 1 compliment about my skills in my entire life.
I was in bed one morning, my cousin having slept over. I let him use the family PC when I went to bed the previous night.
I awoke to my mother screaming my name. Then she stopped. She said "No, x is too smart to let us find this." and then screamed for my cousin.
He had been cruising google image search for cartoon porn and had left it all in autocomplete. My mother accidentally let slip that she has an understanding that I would at least be devious enough to cover my tracks. Its something I guess.