This is not a very useful glitch in anyway, although its pretty fun to mess around with.
Okay, so today being bored, i found a bench and was playing around with it.
Jumping away and then clicking back on it and stuff.
Then i thought about sitting down on a bench while mounted.
What you need to do is get the bar this full and then
immediately click on the bench.
Wala your mount and standing through the bench.
Best part, start walking. You'll notice you can't move
your screen unless using the mouse.
You also cant walk backwards while holding down both mouse keys.
It's a weird little glitch and doesn't really do much.
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*Sry for the paragraph form thing, my keyboard is being f'd up.