The worst thing about the self service checkouts are,, In no particular order.
Any item that is age limited eg wines, spirits, knives, scissors. The annoying machine then displays. " Please wait for an assistant."
Any items that require weighing, eg loose fruit and vegetables. The display changes to "Look up the item on a list." (what's to stop unscrupulous shoppers, selecting an item that's cheaper?)
If you don't place the item in the bag quick enough, the display comes up with " Please wait for an assistant." (again). You can press "Skip Bagging as much as you want, It just won't let you without an assistant.
Any item that requires the issue of a guarantee, eg electrical items. "Please wait for an assistant." comes up yet again.
"Item not recognised." WTF their computer system doesn't know what it is? "Please wait for an assistant."
Once you have managed to scan and pack all of your items, then you get the payment options.
Select cash at your own peril. "Please insert notes into the slot provided."
In the money goes,,, only to keep returning back through the said slot.
You start to wonder if the bank has given you funny money by mistake.
After the fourth or fifth attempt, you try to pay by card transaction, only the damn machine doesn't give you the option as you have already selected cash. "Please wait for an assistant." starts flashing again, only this time it seems to be flashing more urgently. (probably waiting for store security and the police to arrive).
Finally, once you have successfully navigated all of the menu's, weighing tomatoes, waiting for the ubiquitous assistant half a dozen times, then have made the necessary payment. You collect your shopping and the machine now shouts out.. " Thankyou for using the FAST ?? Lane."
It's then you wish you had purchased the sledge hammer on special offer in aisle 3.