Has anyone ever heard of a Silvir in top lane?

Markman's top? yeah there are few of those like Grave, Kindred.

I haven't seen that but I have seen plenty of adc's top.

Did you mean Sivir or Silver? I've definitely heard of Silver top-laners. Not sure about Sivir-players going top. But it's not like it ruins the game on its own. And hey, with her spell-shield, range, and mobility, it could be a decent choice. Bad playing is another issue entirely.

I once was against a Jinx top lane in blind pick... I was so confused that I lost my lane against her.

Guess surprises sometimes work...

I'm fine with people picking champs for non-traditional lanes as long as they take into consideration the composition of their team and who they are likely going up against. Don't stubbornly stick to something like adc top when you're last pick and you have no tanks.

It's usually best not to pick any squishy champion against Mundo.