Definitely curls, I remember getting a Hulk Hogan/Hulkamania workout set for my 5-6 birthday, It had a set of 5lbs dumbbells, jump rope, Hulk song tape, and exercise chart.
I remember curling all day and listening to "I am a Real American". I remember being pissed after a few weeks that I didn't have 24" pythons
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The second "real" exercise I remember trying was the power clean and press in high school(9th grade). We were in aw that one of our classmates could get #135 for 2 1/2 reps.