My worst one was years ago to Croatia. We landed on different airport because of bad weather conditions. That set me back 4 hours to start. Than, we had to wait for the transport for nearly 3 hours (meant to be there waiting for us on arrival). Bus had flat tyre , chain on it snapped later and in very bad snow it was a disaster. I was originally planed to arrive there about 4 pm. Instead I arrived at 3 am. I can not tell you how hungry I was and how much I wanted all nightmare to end there and then.