One of the hardest places to survive on this planet would have to be under the ass of a 600 lb woman for prolonged periods of time. Especially when they derive pleasure from your suffering.
Pat's a tough guy but he is pushed well beyond his limits a number of times in this video.
As for BigmommaKat... she looks bigger and more beautiful than ever Full Weight Productions - Hard Surface Facesitting with BigmommaKat