Hehe reminds me of when I was younger.. I did some skateboarding as well but I never noticed it till now.. I would do a jump off some stairs and land while keeping my balance, coast to a stop, start to walk back up, trip over my feet and faceplant in the sidewalk.
Id fall and run into things just walking around more often than on the board 
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One pill makes you larger
And one pill makes you small
And the ones that mother gives you
Don't do anything at all
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"White Rabbit" - Jefferson Airplane