Bought a few thing in store, used a small trolley as the basket puts a strain on my shoulder and went to the self service. Got stopped from using the till I first went to as I apparently had to use a till with a larger area for my shopping (even though I only had a few bits), got redirected to machine labelled cash only - no good for me, then told to wait for a free space on trolley tills.
Scanned first item fine, second item fine, third item "remove from bagging area and wait for assistant" - waited, cleared by assistant, fourth item "remove from bagging area and wait for assistant" 
and fed up, FFS I could have gone through a normal till by now! Upended all my shopping into my trolley, grabbed my bags, declared Morrisons self service hopeless and marched out and went to Asda round the corner.
Realised at Asda I had left my trolley token stuck in the trolley in Morrisons 
- well at least it wasn't a pound coin.
Probably unreasonable, but felt great for a moment 
.