When I am playing 'sticky carpet' with Shanti, involving wiggling a stick under the playmat, she makes a really weird sound sometimes when she pounces. I've never heard it before from any other cat ... it's a kind of nasal 'popping' sound that's almost a sneeze, but most definitely isn't. It only ever happens as she pounces on the stick. Has anyone else ever come across this or is it that I have a very strange cat? Health wise she appears to be absolutely fine.