It's been warm enough on a couple of days (western Rockies foothills) this month for our neighbor's bees to come over for a visit. They've been clustering around the base of a rose and a purple smokebush where we've been dumping coffee grounds this winter. There are also a couple of other places in the yard (although farther from the hives) that have coffee ground dumps but not the interest from the bees.
Have a look at the photos...it looks like they're filling their sacs with coffee. I'm stumped. caffeinated honey??