I personally find it amazing how much power we as a culture give this little word. If it were any other word at all, except maybe one, we would not react the same way. Four letters with a period at the end (even though it is not a full sentence mind you).
i know exactly! i love it or when you give someone a high fiver and they intwine their fingers with yours at the last second. or when you try to give someone a high five but they open their arms and they give you a hug this has happened to me before :D