Ok more times than not, it has worked in my favor that I will go shopping and an item will go unscanned.

I do not do this on PURPOSE, it just works out that way...
Like I will have a maagazine in my hand while the cashier rings everything up and by the time I leave the store, the mag is still in my hand. Not as if I hid it or anything, we both just forgot...
The most expensive thing that has ever slipped through the cracks was $200 set of flatware.

How in the world that happened is beyond me and the man ringing me up...

But as much money as I spent in that store and the run around they gave me on my china set, I feel it was well deserved bonus item!!!