I've done that when I've had severe meltdowns and felt like everyone hated me or something horrible was my fault. I try not to do it now, and have learned to lessen my meltdowns to a great extent.
When I do it, it's not like I think I deserved to be punished but I lose my words completely and I'm trying to show how I feel. Even if I'm alone and do it, it's like I'm trying to get a feeling out. Not so much show how I feel, just get the feeling out of me, whether in words or in actions.
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I'm giving it another shot. We will see.
My forum is still there and everyone is welcome to come join as well. There is a private women only subforum there if anyone is interested. Also, there is no CAPTCHA.

The link to the forum is
http://www.rightplanet.proboards.com