I work from my laptop on my back patio a lot. Yesterday, I noticed a small black bee with very thin white stripes crawl into the round socket of the outlet next to where I plug my laptop in. I was afraid it would get zapped, but it flew off and was a non-event. Today, I realized that it has been coming back and now there's about 1-2mm of yellow granules coming out of the socket. It doesn't resemble any kind of nest I've found online, but it could be that the bee thought the socket was the perfect ready-made nest and is using it as such. It appears to be a single bee coming back every few minutes to add to it and the bee is not bothered by my presence at all.
If I had to guess, I'd say it's a leafcutter bee.
That said, I obviously need to stop it from doing what it's doing. What's my best bet? Maybe covering the hole with electrical tape? If it did lay eggs in there though, those'll still hatch if I don't clean it out... Eh... and, I'd also not like to irritate the bee. It doesn't mind me now, but I'm betting it will be ticked when it comes back and finds its hole plugged.