mmm, never had one like that, i don't know. Everytime I had one I scream like somebody was killing me and I wasn't even realizing how horrific that sounded, if it wasn't for my mother or brother (when I was single) and later for my husband I wouldn't know.

But i find this link that migth help a bit to understand what are some of the differences.
http://www.nlm.nih.gov/medlineplus/e...cle/000809.htm