Autocorrect, auto-capitalize, even type(/text?)-ahead suggestions. Any time I get a new phone, the first thing I do is change all the settings to where the phone gets exactly what I input and nothing else.
If I want capitals, I'll hit the "shift" button on the on-screen keyboard. The phone needs to know its fucking place. And may god exaust his emergency reserves of mercey on any phone that decides I didn't mean to type "Bueler", but rather "butler". Because I swear to fucking god it's gonna need it in about 3 fucking milliseconds.