DCM, in Sweden we have even had reports of LiPos that burt during storage.
According to one owner it was an EFRA approved hard case that was 80 % charged. Others had stored them fully charged.
As for LiPos that give in under use:
http://i319.photobucket.com/albums/m...wulf5/lipo.jpg
http://i319.photobucket.com/albums/m...5/IMG_0049.jpg
Photos are from Groovy Drift