The ‘bad’ things that could happen will depend on each person's approach and way of being. If that person is naturally negative, he or she will see everything negative, that's the way it is.
Not so happy events always happen, like when I arrived here and I had a lot of complications renting with a kitten, but something very positive came out of it and although I felt very bad and overwhelmed at first I took the positive part, I learned and moved on.
Things... are things, you have to learn from them. But a lot of people take it as... horror.
Have you had any travel related mishaps?
The only minor thing was that my cat became very nervous, she cried a lot, during the transfer from one plane to another and I had to give her drops to calm her down. Otherwise, everything went perfectly.