Cashier Conundrum

Guess it's another stay at home day. Actually that's a little bit of a lie, I did go out briefly to Lidl to get some bits, and subsequently became the hero of the que! Actually that's a bit of an overstatement. On my conveyor belt I noticed a nefarious liquid seeping from somewhere behind my goods. The cashier was just grabbing some paper towels but was clearly out of reach to get to the puddle. So I opted to take the roll and clean it up! Job took a few seconds but hopefully made a difference on the cashiers evening. He even gave me a free carrier bag. Today I learnt that being a good samaritan can save you 3p!