i really think mungojerrie's proud of how mischevious he is, but not 
in an evil way like macavity. he's more experienced at stealing than 
rumpleteazer, he seems older than she, and thinks it's an excuse to 
take much of the credit for their work! he and rumpleteazer were 
together at the mating dance (rather close) and they started being 
together more after that dance (hehe, you can probably guess why).

umm...i was going to use the name rumpleteazer but someone already 
has that name! so i'll be anonymous!