As long as I can reel them off without thinking about it, I can do 30 decimal places, which is the max I ever learned.

For the talent show at giftie summer camp one year, a couple of my friends recited pi to 100 digits, alternating each one. (It's harder than it sounds.) The rest of us memorized what we could as a show of support. I was 15 and don't remember at all how hard it was, but I'd guess that doing it as a group activity made it fun.