Hi Sadie, welcome on the forum!
Knives and Pens is for a lot of fans the first song they heard, and immediately loved it.
It really is a good song!
And I think you're so cool, you do not have a favorite song. Me neither, all of them are awesome!
I'm so jealous right now, a lot of people here have met the band, and I haven't because they haven't been to my freaking country ever.
But they're coming, October 28 (:
So yeah... Have fun on the forum and have fun meeting new people!