Yeah, this is pretty commonly known, but for the people who don't know:
Step 1, Sit on a bench in the dining table.
Step 2, Get someone to sit on you
Step 3, Try to sit on the bench again as soon as the person turns (see pic)
Step 4, Click anywhere
Step 5, Put building mode on to move anywhere.
To use this to wield weapons differently do the following:
Do step 1 to 4.
Wield a weapon, and if you want to stand up eat or drink.
I remember you could also do this with the vines that snared you in people's dungeons, but I think it's fixed. I remember we used to use this way to make your chair able to come back.