Thanks! Ha, when I asked my best friend, she also suggested a gun. And I facepalmed, because it just seemed so obvious and why didn't I think of it?!
Handcuffs are too... consequences. Not that that was the first thought I had about handcuffs. No, my first thought was of the Doctor and River. I feel like Doctor Who ruined my brain. Also, I didn't even know I remembered that about the two!

I dislike guns too, but they can be sexy in fiction. Which probably sounds just as stupid to some people as it sounds to me when people say guys with cigarettes are sexy.

Ha, I didn't like the Doctor/River sex jokes either.

Handcuffs came to mind.

Thanks, but not what I'm looking for, because it focuses on the consequences. I think I'll use the gun.