The one where you almost paid CZK 1000 for a CZK 25 ticket

You're sitting in the tram, just staring ahead, and in the distance you see a guy showing a badge to another passenger. Almost immediately you realise that you forgot to buy a ticket. You look outside to see how far away you are from the next zastávka, wondering if you can get out before the inspector gets to you. Your mind moves to your wallet, wondering if you carry CZK 1000 with you, because if you can't pay that amount on the spot, it will cost you CZK 2500 if you pay it via bank transfer or at the DPMB office. And in both cases you still have to pay for a 60-minute ticket.

Sigh... If only you had not forgotten to buy the damn ticket!

While realising that the inspectors probably carry a mobile payment terminal, the yellow terminal next to the door catches your attention. Normally, the inspectors would lock them to prevent passengers from still being able to beep a ticket, but for some reason this one wasn't locked. You quickly get up, casually walk to the doors, as if you're getting ready to get off, and you wave your phone in front of the terminal. "BEEP!" It feels like a 25 kg weight has been lifted from your shoulders. "Now I am covered for at least 15 minutes" you think to yourself. "Or is it 20?"

Not sure, you decide to check the pipniajed.cz website to find out. And yes, there it is: if your journey is not longer than 15 minutes, you can beep out and PAY 20 for a 15-minute journey. "Hmm, I didn't know that it's also possible to check in and immediately check out, if you're sure your total journey is going to be under 15 minutes." you almost say out loud.

Either way, once your journey is going to be longer than 15 minutes, you don't check out. You only check in every time you board a different vehicle. By the end of the day the DPMB system will calculate ("Probably estimate!" you think to yourself) how much you need to be charged. But then you see the clear explanation on the site. If you don't check out, the next tier is 60 minutes, which costs you CZK 25.

"This is interesting," you mumble softly. "You check in, ride for twenty minutes, get out to grab a cup of coffee and chat with a friend for about 35 minutes, jump in a tram back towards home, check in before the 60-minute period is up, and ride the tram for another twenty minutes back. That's 75 minutes in total. But since your last check-in was before the 60th minute since you started the journey, the system charges you only for one hour and you get those 15 extra minutes as a free bonus!"

In any case, the maximum the system will charge you is CZK 90 for a 24-hour ticket. So, instead of adding up CZK 20 or 25 for every time you checked in that day, the total is capped at the price of a 24-hour ticket..

You realise you heard a bell and the tram is not moving. "...dražy... Main train station" you hear while your ears refocus on your surroundings and you look up. You make your way to the doors, making every effort to avoid eye contact with the inspectors, who are standing in the wheelchair space, carefully watching passenger enter. "It was less than 15 minutes ago that I checked in, but I'm not checking out. I'll gladly pay for that one hour, after narrowly escaping a CZK 1000 fine, minimum!"