You need to fart
Try to hold it in until the urge is gone.
Do it and apologize lightheartedly. No biggie!
Do it anyway and say, "She/he did it!!"
Try to cover it up with other loud noises.
Stand in the middle of the room and let it go--LOUDLY.
Go into the other room unnoticed and do the deed.
Try to quietly let it out without anyone noticing.