eat 12 jelly beans? How is that a challenge? - how about identify 12 jellybeans while blindfolded. although in cheaper brands a lot of them taste the same..

12 days of christmas related stuff would probably be a good idea, keep things fun and festive..maybe see who can sing it the fastest without stuffing up

Glad to see I'm not the only one on a BSG train of thought.

if you work in an office environment then 12 pushups mught be a big ask of some people.

you could play 12 degrees of kevin bacon ;)

re 12 monkeys - I can name 5 off the top of my head [the film has a lot of 'that guy's]

Madeline Stowe

Bruce Willis

Brad Pitt

David Morse

Christopher Plummer