Again, another 1975 Topps card arrived yesterday which does this; I liberated it this morning. Very frustrating. I know that studies here and there over the past 20 years (Bruce Moreland's paint can shaker experiment comes to mind...) have shown that you have to really intentionally beat the hell out of a PSA slab to do any noticeable damage to the card inside, but I still don't like the cards moving around. It just does not jive with my OCD. I guess this is why I did fine back in the early 90's with screw-down cases for vintage cards. Sure, they were destroying them in other ways, but at least they didn't move around.
