The spell check drives me CRAZY, though it is often hilarious with what it comes up with.
For example I needed to type the names of the drug I am taking for my amoebas. It is Diloxanide Furoate. You would not belived the number of times I had to tussle with the bloody machine to get in what I wanted rather than what the computer wanted.
First it came out as diloxanide FRUIT
And then diloxanide FUR OATS
When I keyed in dysentary just now, it came out as SYSTEM TRAY.