I would never be brave enough to try something like this.
Don't sell yourself short, everyone else is already doing that for you.
> Spectators and media commentators questioned the stunt's authenticity, viewing it variously as performance art, a statement on consumerism, a viral marketing achievement or the work of street artist Banksy.
In all cases, the reason that the OP doesn't believe he can do this has to do solely with his false limiting self beliefs about his abilities.
Seems like the potential downside to doing this is a lot higher than the examples you gave.
If just one of them decided to call the cops, he'd be arrested, and that might end up with him being banned from re-entering the US. If each place only has a 1% chance of calling it in, we're talking about cumulative odds around 1 in 3.
That seems like a pretty bad worst case.
It's not about underestimation of ability, it's about not wanting to take a risk or flout established social norms.