A LOT of things in Super Mario Sunshine. Having to go through that 15 minute boat ride to put out the slime on the pipe EVERY TIME you get a game over on the "8 red coins of the instant death water slide", and a lot of things in platforming, such as the fact that jumping towards a wall cancels your upward momentum and sends you sliding downwards (killed me SO MANY TIMES in the final boss fight), and the fact that when you hit a ceiling when using the hover nozzle you get stuck and can't move horizontally (what were they THINKING!?) and the shine where you have to get up to this place and repeatedly pound the fruit things until you get a durian (which, by the way, is the only fruit you CAN'T pick up) and if there's another fruit below it and it lands on it, it will bounce off into the water and you have to do it AGAIN. When you FINALLY get a durian, you have to be careful getting it to the Yoshi egg or you'll accidentally kick it somewhere you can't get it back. Once you DO finally get to the Yoshi, you have to spray fruit at the fish to turn them into platforms (but you'd better do it at the right height, or you'll mess up) to get across. And if you fall off these platforms, you have to swim back to the lift, get on, and pound the fruit things AGAIN (this can take up to 10 minutes). So when you get to a certain point, there's fish to get you to a certain platform and it looks like you have to do the "ride the fish platforms" another 3 times, but don't be fooled, it's impossible. What you're SUPPOSED to do is jump over to a ledge on the cliff and eat a coconut, which will turn Yoshi ORANGE, and ORANGE platforms go UPWARDS instead of sideways. So you float back, turn the fish into a ORANGE platform, and float up to spray juice on the slime and get the shine. HOW THE HELL WAS I SUPPOSED TO KNOW THAT? And then there's the level based after a Japanese marble game, which is mostly luck based, and apparently wasn't bugtested at all because it's glitchy as hell.
That game has a LOT of problems.