Self-Checkout Grocery Stores

You know these places. Fresh& Easy to give an example. You come on your lunch break to get some sushi. Here is how it all goes down:

*Slide Sushi*
*Nothing Happens*
*Slide again*
You: WTF?
Guy Behind you: Hurry Up!
You:I'm trying! God!
*Slide again*
You: Cashier! Help please!
Cashier: Slide it Like this
You: That's how I did it
Cashier: No, like this
You: Ohhh...
*Boss Storms in*
Boss: It's been 2 hours!
You: FUUUUUUUUUUUUUU