tape recorde3d his conversations where he talked about (among other things) firebombing the brookings institute, breaking into daniel ellsburg's shrink's office.
then there was that little deal with watergate.
the wondering around drunk, and talking to pictures on the wall was also a tad weird.
He also wore his hospital nightgown backwards when he went in for surgery and ran down the hall to see how nurses reacted!
Here is a funny story though:
Nixon was meeting with some gay rights advocates in the White House. He listened patiently and attentively for an hour and after they left he told an aide, "Well, that was a real sausage fest!"