What if I wanted to tip that man for the great picture?
Could I use that address? Does he still have control over it? Was it never his address to begin with? Did he just write down a random address for the lulz?
And what about this link on XKCD. Is that a public donation address or just some experiments from the site owner?
My proposal:
If you're displaying a throaway address, a fake address for a demonstration, for a joke, for a gag on TV or whatever and you want to make clear that people should not send bitcoins to it, then precede with a #.
For example: #19nxrYucX3B6rDZ1Gk2M2VEb2LFAGEAfsU
Now, this doesn't have to be used every time. Just in situation in which you think the address could be mistaken for a real one or in a situation with reasonable doubt.
What do you think? Any other suggestion?
Thanks.