I'm a railway guard. I've seen hundreds of CFs (and a few outright scumbags too). One which sticks in mind is someone who boarded a train at station B, ignored me when I first asked to see a ticket and then asked for a return to station A. I pointed out that the train wasn't going to station A, the train had already been to station A. He launched into the most transparent performance of "oh my god I'm on the wrong train" I've every seen. Bear in mind that station B has only two platforms, westbound trains always leave from one, eastbound from the other. He had to pass through the correct platform to get to the wrong one. There are electronic signs on all platforms. So to board the wrong train here you'd have to be incredibly dim.
Never mind, I'll look for a train going the other way in a minute, let's sort out your return ticket from B to A. Card declined, no surprises there. He then starts going on about how he was supposed to pick up his son from his ex etc.
Obviously I'm not going to get a fare but I'm still a helpful person so I looked up the times and told him that if he changed at station C, there was a train back to station A within 10 minutes. Now he tells me that he can get his brother to meet him at station D. Can you smell a rat here reader? It's quite a pungent rat.
So I play along with his story "but what about your kid, surely you need to get to him soon or it'll be past his bedtime. You'd have to wait an hour at station D but if you change at station C it's only 10 minutes. Can't have him waiting past his bedtime."
We arrive at station C and I open the doors:
"Here you are, straight across the bridge to the other platform".
"But please I'm begging yah, I've got this court-ordered contact..."
"Exactly, you don't want to make him wait, the bridge is just over there"
"But please"
[calm, monotone voice] "Step off the train please"
Without a further word, he left.
It's amazing how many people think we were born yesterday.
"You've already seen my ticket"
"I'd like to see it again, please"
"Oh, I need to buy one"
"I thought you might"