l have wondered that too, l have a Ragdoll cat who, when she's on her back, looks like she's frowning. l asked the owner but she doesn't know, that's what she says anyway. The blaze between her eyes intensifies the look of Grumpiness. l've seen this blaze in certain Ragdolls, FloppyCats come to mind. l'd like to see her (Grumps) in action, her personality.