When did you last check your mouse ?

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zork0000 · 56-60, M

You're too young to remember but there used to be a ball inside them and once in a while you had to open it up and clean these little rollers that would get gummed up.

Teirdalin · 31-35

You can still find those all over the place in thrift stores. I cannot imagine anyone who still would buy one though, although the ball is kinda fun.