Coincidentally........
I was answering the call of nature in the toilet on the train earlier today.
Suddenly, there was a knock on the door and a voice demanded, "Tickets please. Show me your ticket".
"Sorry old bean" I replied, "But I'm taking a dump in here, you'll have to wait"
"I don't believe you" came the terse response, "Slide it under the door then"
"No problem my good man" I told him, "If you're interested, the yellow bits are probably sweetcorn"