It's because they announced to shareholders they made $500 million less than expected in the last 3 months. They expected to make $9.1 billion but made $8.6 billion. Their sales are down worldwide indicating it's not just a US thing.

Or the opposite. I now actively avoid Starbucks due to their behavior towards unions. When I do go, I always ask the employees if they have unionized yet.

Possibly. Starbucks, Workers United made ‘significant progress’ in last week’s contract talks.

I wouldn't put it past them to under-report their earnings to get more leverage in unionization negotiations, engineering a temporary drop in share price.

Is that your kink?