Insect and Spider Identification: CLOSED: Bug ID needed., 1 by MOLLYBEE

MOLLYBEE wrote:
This is yet another funny looking bug that decided to pass thru my garden. This one was a little strage looking with his "horn" on the back side. I watched it as it walked up the tree and then he stopped and stood on his tippy toes and curled his horn under himself and poked it in the tree bark! It was so weird!! Not sure what he called his self doing, but he soon went on about his merry way.
Can anyone help ID it so I can find out what he was doing?
TIA
Not the best pic, but you can sorta tell what I mean.