About 6 years ago I was living with my cousin and we had a house party. Things were grinding to a halt around 3:30 AM when these random chicks just showed up. By that time I was quite high and drunk enough to the point where I really didn't give a shit about anything. So I was sitting in the backyard smoking by one of the randoms and the following exchange took place.
Me: So do you have a job?
Her: Yeah, why?
Me: Just asking. Can I get your number?
Her: Sure.
Me: OK, I'll be right back.
I went in to get a pen and paper for her to write her number down, but before I could find that I noticed the Etch-a-sketch on the floor and since I was in "eh, fuck it" mode I returned to the backyard and handed her that to give me her number on.
To my amazement not only did she pull it off without hesitation but her phone number is still on that Etch-a-sketch 6 years later after being moved many times.

It's really no mystery how she had no problem pulling this off since I later found out she's a tweaker and they feverishly welcome these type challenges, but how the Etch-a-sketch defied it's own mechanics for years is simply stunning.