Kattysmom, when you say flick, do you mean up and down or side to side? Margaux's tail swishes sideways (like ET's in snowy's video) when she's starting to get anxious or unhappy. When she really starts to get upset (like if I'm petting her too much), her tail thumps up and down. Celia's tail, on the other hand, thumps up and down when she's sitting between my legs and I'm petting her, and it means she's happy. But it's a lazy sort of up and down thump. Margaux's is a forceful thump.