Women in line in front of you at a checkout who wait until they're told the final amount before they even BEGIN to open their handbag...then their purse...then their change purse...

Next, they look back at the amount, then their brain engages (really, if it's quiet, you can hear it!), then OMFG, here it comes, they begin to speak----interrogatively!
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If I didn't have a shrink, all of my friends would think there's something wrong with me.