My computer mouse if acting kind of strange.

[Psychospacecow]

It randomly jerks right and then left, won't always click when I want it to, just move to right as I typed this without returning, and sometimes clicks on its own. This all started yesterday. Any ideas?

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Its broken, back-up mouse employed from sibling. Apparently is also broken because its laser doesn't turn on.
Using drawing tablet.

Edit: found a working mouse.