Big Clive on the topic - [https://www.youtube.com/watch?v=wm4CSrH8WTU](https://www.youtube.com/watch?v=wm4CSrH8WTU)
Just put the one you've got in the bin and order a smartcard then you don't need to feel guilty anymore - https://www.spt.co.uk/tickets/subway-smartcard/