Poll in other people's thread? Why possible?

How come people can create polls in other people's thread? This should not be possible. A poll should be created only if you open up a new thread.

Here is an example: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1284738418/23#23

Now that is weird. I have no idea how they did that.

Anyone else know?

Mowcius