Mac OS 9
The last time Apple tried to make the old Mac look cool. It was so unstable it would give you a headache. Some people said it was the worst OS since the 80s.
My Mac OS 9 gave me a headache when it crashed in the middle of a presentation.
I tried to print a document and it crashed. My teacher gave me a detention.
My friend said Mac OS 9 was like a cat that knocks everything off the table.