Ask them if they dialed in the new grinder with fresh beans right away. A new machine needs a full setup, not just plug and play. They might have just swapped it and kept the old settings, which never works. The burrs could also need a break-in period to settle down.

Wait, spies over avocados? That's wild! I would have just been annoyed at the line holding up. It's crazy how different people see the same normal thing. I get what @samj27 means about the little stuff, because my brain never goes to full spy thriller from the grocery store. Mine would be a sad story about someone buying one lonely avocado. This is a good reminder to look harder at my own boring moments.

Ugh, I just use a rocket blower and hope for the best.

My brother once fixed my car just by the weird sound it made over the phone.

My graphic designer friend swears by that trick, calls it the "hero color" rule. It's crazy how one shade can pull everything together.