Years ago the Valiant was depressurised during the approach checks. One Smart Alec, myself, thought this would be a good time to open my DV window and chuck out all my rubbish over the Kenyan countryside. This I did and I was halfway through the rear crews contribution when it suddenly occurred to me that there were two Rolls Royce Avons humming away just behind my right shoulder.
A close post-flight seemed OK and we did not have any trouble coming back to the UK so I presume half eaten butties are an acceptable jet fuel.