I just spent the last half hour reading through this - hilarious! I'm 52, born 1970...so I can relate to most in here (there are a few geezers on here posting stuff I can't relate to - I'm looking at you Stephen..).
Here's a few:
Gainesville area code 904 - I grew up in Jax, same area code but it was a long distance call!! WTF?!? (my roommate would chap my ass and tell whoever was calling me from Jax that I'd call them back when he was just bs'ing on the phone, then I'd have to pay the long distance charge to call them back! - I think for a while the phone company would charge the caller and the callee/receiver a long distance charge).
The NFL pencils that they sold at school - had the team colors and team name (getting a Cowboys pencil was like finding gold).
Buying baseball and football cards at the convenience store - the gum in those packs sucked!
Putting a playing card (or Topps card) in your bike spokes to make the 'motorcycle' sound.
Schools had the early year/fall sale where they would sell pin-up posters of Farah Facett, Marie Osmond (Donnie for the girls), Dukes of Hazard, A-Team, NFL teams/QBs, etc.
All the sit-coms, watching Leave it to Beaver after school. I still yell "Schneider!" if I see someone with a huge key chain (with lots of keys on it), Sanford and Son, the Jeffersons, Archie Bunker, What's Happening, Kid Dyn-o-mite!, Gilligan's Island, Three's Company, Bosom Buddies, Brady Bunch, etc.
Listening to UF football and basketball on a transistor radio (Eugene "the Dunking Machine" McDowell).
Artificial turf on Florida Field (saw my first UF game vs. UK in 1979 and remember running around on the field after the game) - and the old Alligator Alley (I saw Kentucky kill us 102-48 in the 1978/79 season there).
The candy - chewing tobacco (shredded gun), the dip stick things (that you licked and dipped into flavored/colored powder sugar), now-and-laters, candy cigarettes, etc (I think they still make now-and-laters).
Cinnamon toothpicks.
Trying to wear as many MTV buttons as possible.
Several students who dressed (everyday) as either Prince or Pat Benatar.
Getting swats by the dean of boys.