Every PUA talks about the hook theory, but what if the girl shit
tests you right away and doesn't bite the hook? Especially if
this was on a single hook. Example: "Quick question, but what
is that you're drinking?" She could shit test with a, "Figure it out
for yourself."
Now, in double hooking, the target would have two options.
She would either bite one side of the hook, or bite another side
of the hook -- thus, double hooking. Double hooking should be
BOTH a situational and opinion opener. It can be direct or
indirect. Example: "Quick question, but what is it that you're
drinking? (situational) And is it good? (opinion)." She might shit
test one, but she would have to answer the other one, by which
double hooking is effective because it would throw her off
guard.