Bigger capacitors can also fail in this way. Here's a 60uf from one of a pair of 3 hp single-phase motors running a 440v 3-phase generator. It had been getting a hammering when I let a couple of bozos loose on a big planer as a favor. They kept stalling and restarting it, too stupid to grasp the concept of a mechanical starting clutch. This was the result, [2007 pic]:

[Linked Image from electrical-photos.com]

I fitted a new cap, no visible smoke let out! The other motor was apparently undamaged by the incident. Both have continued to run OK for the last couple of years .

Wood work but can't!