My Arduino 101 just smoked, but it still seems to be working?
I'd plugged it into my computer via USB, and also into a 12V wall wart into the barrel jack at the same time. Meanwhile, another chip off-board was getting power both from the 5V pin, and the Vin pin. (The other chip was an H-bridge, and needed both 5V and 12V to run.)
The last thing I plugged in was the wall wart to the wall socket. It started buzzing. Smoke came out of the Arduino, near the Curie chip. I unplugged it as fast as I could.
Now it's just plugged into my laptop, and there doesn't seem to be any permanent damage. It's running the last program loaded, no problem.
Edit: Problem found: The H-bridge I was using had the input/output pins reversed from the configuration I was used to. So it was pushing power into the Arduino 101's digital pins at 12V.