I was just looking at one of those 'prove you're not a robot' passwordy things and it struck me there are some weird things we do that could make people wonder what we were all about back at the turn of the century. 

Not sure about anyone else but with those password things I try to make words out of them.  Some combinations can be very funny and I wonder what someone in the future might think about their use. 

amfrght - am a fright
drsienmv - dress in mauve

Another thing to think about is watching a video of someone playing a Wii with no sound and not being able to see what they are following. It would look like they were challenged in some way.

Mmm food for thought.