3 of my 5 pullets are doing this when i go to pet them. They squat down and hold their wings out and get real stiff until i take my hand away and then they go about their business.
Here is the same pullet from above that i snapped a quick pic of that i thought was sorta funny. This is Bailey saying "hey!! why did you just pet me and make me squat down like that?? You KNOW im about to lay now" LULZ!!