I remember, when I was an up-and-coming comic, how annoyed I would be when the famous guys would show up and just take everyone's spots.

The good thing about L.A. is that there's always someone more famous 100 yards away from me.

We just kind of wanted to play with these iconic moments of action. There's a really small one that always makes me laugh really hard, where there's a big shootout at the end, and the moment my gun runs out of bullets, I turn and there's just another gun sitting there, and I'm, like, oh, nice.

Honestly, it's really hard improvising and it's really stressful and humiliating at times. You're taking really big swings that potentially are eating up a lot of people's time and resources at set in your attempt to discover something funny.

Really, if I'm honest, sci-fi is where my sensibility instinctively goes - I'm a big comic-book fan.

It was amazing how much their [Seth Rogen, Evan Goldberg, Shauna Robertson] process seemed familiar to me, translating that into the work that I had done and giving actors a lot of freedom and doing a lot of improvisation and a total respect and collaboration with all the department heads and all the crews, and just really making it an enjoyable industry rather than just clocking in and doing a job which a lot of movies are.

Every once in a while you definitely have to film someone for half an hour saying something that you do not think is funny because for the previous two hours they said a bunch of stuff that you think is really funny.