Whar are POPS?

I ALWAYS READ ON EBAY "POP WAS LIFTED" WHAT ARE THE POPS? THEY MUSSED B SOMTHING IMPORTANT BECAUSE NO1 EVER BIDS ON THEM THANKS
Babz

Proof of Purchase. They were the lil points back in the vintage days that you could send in for free stuff. Quite a few people back then, who actually kept stuff on the card still removed the POPs for mail-aways. :)

MTFBWY and HH!!

Jar Jar Binks

THANKS JARJAR

I ~still~ have a bunch of old POPs that I had been saving for free mail-away figures. Sure wish I had used them up back then :(

Please don't yell at us, Yoda's Master. ;)
I have several vintage cardbacks that I saved. Some have no POP, since BACK THEN YOU ACTUALLY GOT MAIL-AWAY THINGS FOR THE POPS!!!! Oops. I yelled, too. Sorry. :( ;)