The thing about farts is this. If its just you and the other pilot and one of you farts, then reason dictates the one who did not fart will immediately know who it was. Now, if you have a third person in the cockpit, such as a jumpseater…well, now my friends, there’s a mystery afoot.
I love jumpseaters primarily for this reason…I can let out those slowww teasers with nary a sound. When the fumes rise, let the blames begin.