It just happened to me, and I'm still kind of shocked.
I had a crappy Chinese 12V/2A wall mounted power supply (for a led strip), and it exploded 1 mt from me. The case cracked in 2, an electrolytic condenser was expelled like a bullet, landed ~1 mt away, and caught fire. I was very lucky to be there and stop it!
The internal circuit looks crap, plus now it's 50% burned/blackened.
There was what looks like a fuse, good luck with that ;-)
Now, my paranoia is kicking in, and I want to replace all no-name power supplies with quality stuff.
Any suggestions about brands, resellers? I'm located in Italy.
Many thanks!
Andrea