I have had hairs kicked at me by our Chaco Golden Knee (G.Pulchripes) and Mexican red Knee (B.Smithi), and I have been given the "peace signs" threat pose by a Nhandu CHromatus and a P.Cambridgei.
But the most upset T I have seen to date, is owned by a friend of mine, and it's a 3" Chilean Rose (G.Rosea). Seriously, when he got it, it was as meek as a mouse, but something has happened to it in the meanwhile, and when last I saw it, it was the most ticked off T I have ever seen, kicks hairs, raises legs, the works. It's actually quite scary, cause they are supposed to be one of the most docile...
HS