Okay, I have done a lot of crazy dares in my childhood. I won't list a few of them because I don't think it'd be too appropriate
When I was 6 I learned all my first cuss words (I grew up in Kansas City, so my neighbor who was about 4 years older than me was teaching me). My neighbor and I were good friends, but then there was this other kid who lived a few blocks down the street, when he came along, we were more mischievous than usual...
So anyhow, they took my right hand, and closed my fist, but had me keep one finger up. Then they said "Okay, now keep your hand like that and go show your mom." I, being only 6 mind you, nodded and went into the house and then held up my hand and said "Mom..."
SMACK
Before I could ask what it meant my mom started yelling at me and slapped my hand. Don't get me wrong - my mom is a sweet and loving lady, she just hated the middle finger thing
Okay, well that isn't necesarily a crazy dare, but it was funny.
Probably the craziest dare I ever took was to get naked and run to a house a few blocks down the street and knock on the door and ask if one of our friends could come out to play. His mom answered the door and laughed so hard (I was still 6).
I'm sorry, but "Hack into a computer network" ????? When I was a kid we grew up without the internet - although we had a really old computer internet access was still about 6 years away from the common person. Man... it just makes me think of how simple my childhood was compared to the kids today.