I just came from Budapest today, and on the last day of my trip there I had the worst experience ever . I had to catch the bus for the aeroport so I was in a hurry. Used the metro to go to Deak Ferenc and stoped to bay my ticket, validated it and show to the control in metro entrance. When I arrived to Deak station at the exit some people stoped me to show the ticket and unfortunately I couldn't find it, mybe I just have thrown it away I dont remember because I really was in a hurry. So they asked me to pay the fine and I was nit able to pay it and they write a ornage paper so I can pay it later,but I might not go to Budapest for years. Dont know how and is it very importanat to pay it!