Allow me to go chronologically:
Very Young Years:
-Probably rattles and things (I don't remember that part of my life)
-Tom & Jerry (I don't remember this either, but my mom swears up and down that T&J used to crack me up hardcore)
-Sesame Street and Mr. Rogers Neighborhood (had to watch these every day before I took my nap)
-The Get Along Gang (I even had the caboose and PVC figures of a lot of characters)
-The Muppets (especially Gonzo)
Elementary School Years:
-The Muppet Babies (my friends and I would play MB at recess. I was always Rowlf)
-GI Joe action figures
-Micro Machines
-Teenage Mutant Ninja Turtles
Middle School Years:
-Marvel Superheroes (especially Wolverine)
-The X-Men cartoon (I made my brother and sister record it every Saturday morning because it was on while I was bowling)
-The Beach Boys
-Girls
-Baseball Cards
High School Years:
-Baseball (all things baseball; playing, stats, cards, collectibles, individual players, especially Bo Jackson, Robin Ventura, Fred McGriff, David Justice, Chipper Jones, Rafael Palmeiro)
-Girls
-Practical Jokes
-Muppets and Sesame Street
College:
-See Above
Very Recently:
-WWII-type video games (especially Medal of Honor and Call of Duty)
-Movies based on Marvel Superheroes (Spider Man 1&2, The Punisher, X Men 1&2, but not so much Daredevil and Blade and definitely not Hulk)
-Actually, movies in general. I especially like Pulp Fiction, Boondock Saints, Reservoir Dogs, Kill Bill, Tombstone, Troy, etc.
-Christmas Shopping
-All Things Muppets
At This Very Moment:
-Smart movies
-Hemingway's For Whom the Bell Tolls
-All Things Muppets