I remember--
Running across the treetops in Perez Park to get to the Lake or a door mission.
Sneaking my lowbie through Steel Canyon to get to Icon because I goofed up some costume part.
Dodging traffic because I thought cars could cause damage (silly newb)
The original Paragon Dance Party.
When they first introduced Lusca, I spent hours in IP trying to "summon" her. There were dozens of rumored ways to do it. Of course, none of them worked.
The first time I won a costume contest. I was so happy, I bragged about it to my wife.
The first time I hosted a costume contest.
Dinging my first 50, at the same spot, from the same contact she got her first mission from in City Hall.
Street sweeping, when everyone had run out of missions.
"I am too far away from my sidekick."
My first Hamidon Raid. I was terrified of screwing up. So many toons gathered up in Founders. Seeing 40-50 characters fly, super jump and super speed across Eden was soooo badass.
The first time I walked into Atlas Park. That's when I knew this game was awesome. Dozens of characters, all completely different, erupting fire or ice or rain or energy or spikes or who-knows-what.