I wish autocorrect would decide whether it wants to be helpful or useless.
It's handy when it catches simple typing errors on a small keyboard. It's utterly useless when I'm trying to type in something and it decides to change it for something else entirely. Only yesterday I was trying to note down the numberplate of a truck driving dangerously through town and my phone decided to change it to something totally different, meaning what I ended up with is worthless.