FC-ing a song but losing pp because your accuracy is shittier. Really hits a blow to your heart. How I knew, is because I experienced it. Thanks a lot Sotarks :/
Missing on easy sliders.
Annoying ass fail sounds which include screaming anime girls. Sorry anime skins but I don't need a girl screaming WAAAAHHHH in my ears when I'm already demoralised from failing the same map over 56 times.
Choking a map at the end.
Random glitches in the map causing you to choke an FC.
People just calling you when you are about to FC something.