It seems many have claimed there are magnetic issues in some of the shots.
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The day after my niece-in-law got her clot shots, she posted a video on fakebook showing a quarter sticking to her arm. My unjabbed (still to this day) sister came into frame in the video and pulled the quarter from her arm and put it back on. It stuck, and my sister confirmed there was no glue or sticky substance holding it there. Nobody can explain it but it was for real.