I will give you a simple task. After it, answer the poll.
Task: Do not check what's inside the spoiler.
There's a small surprise inside... But don't open it.
Can I check the spoiler after I've voted for No! ?
Of course not. It destroys the whole purpose.
Alright!
Hah, I was tempted to be a smart ass and check after I voted. XD
Temptation averted. I got reddit watching my back.
Whoops, I didn't read the question. Accidentally voted yes instead of no.
Checked anyway because why not. Underwhelmed.
I watched the vid before realizing I was supposed not to. I feel proud.
Most people just cheat and first click 'No' on the poll and watch it after that.
Voted no, thought there could be goatse inside.
Even if humans weren't hopelessly curious, this isn't really the best medium to conduct an experiment like this. I would have opened the spoiler no matter what because it was obvious what the point of the thread was. It works much better when the person being tested is under the impression that there are genuine consequences to disobeying. Basically here you are just saying: I double dare you not to click it.