Why do you shudder when you wee?

Are waves slowed by kelp, is there a neural basis for societal differences, why is there more rain after a thunder storm, why do electric stoves keep cooking after they've been turned off, why does the sound of an aircraft change as it flies towards us, why do you shudder when you wee, what does lightning do to a tree when it hits it, how did we define a global time.