What would you do in this situation?

I'd fart and let it out slowly so that it wouldn't make noise, and I'd hope that it didn't smell too bad.

A least one thing will be out before the elevator moves. No amount of cheek holding works against an Air Express!

Under the pretence of staving off cabin fever I would start a pretend fart competition. The tragic irony of course being that I will fart them into the ground for real.

Fart then blame the person next to me.

Tough situation, first of all. Keep in mind they may have to let one fly also, so u may wanna ask them if they have any spray, anything like perfume, cologne or a scent to mask it.

Just fart (silently) its not like anyone would know who it was LOL

One may delay Mother Nature, but ultimately it cannot be stopped.

let it rip who would know it you. You can always look like someone else stunk up the elevator.

Let it go and then innocently look around so the others will all think it was some else.

I would be the one with the very bad stomach ache. I would die of embarrassment if I let one slip.