Last year I bought a packet of random chili seeds and planted them in various pots around the house. Only one plant survived and it turned out to be the most interesting chili plant I have ever laid eyes on. Every couple of months it produces these bright red, fire-hot, perfectly round chilis. I know you can get a great variety of chili plants in places like Mexico but we generally seem to have two varieties, big and small 
If anyone knows anything about these guys, please share the knowledge …
Chili balls
are the habenaro’s perhaps?
actually after doing some research it seems they might be from the Pimento variety.
Chilli Ball – A brightly coloured chilli that is round in shape. The colour will vary between green, red and orange depending on maturity. The flesh has a crisp, strong, rich hot flavour. The seeds are hotter than the flesh.
You guessed right it seems.
Also ‘Ball Chili Red – much hotter than it’s greener relative, this small round chili is about 3cm in diameter and is excellent in Mexican dishes and chutneys.’
from http://www.chilisalsa.com
Dale, I think your are right. Check out this pic of them http://en.wikipedia.org/wiki/File:Cherrypeppers.jpg