Edit: Before I describe the trick I would like to say that this trick was presented as a having been achieved through intense concentration and channelling Chi energy from around the performer's body into their abdominal area. Chi energy is a concept in Chinese medicine and Martial Arts. It is non-scientific and unverifiable.
I was recently at a performance which featured a young Shaolin monk (about 12 years old) performing a trick where a clay bowl apparently attaches to his bare stomach even after volunteers tug at it.
As the volunteers attempt to tug at the bowl, an older monk holds the bowl from the sides. He doesn't seem to be exerting any significant physical force.
I went up to stage as a volunteer and I held to the sides of the bowl, ready to give it a pull but the older monk uttered a stern "No" and told me to hold the bowl from its base. I gave it a pull with all my strength and indeed it remained attached to the monk's stomach.
I searched for this trick online and I found this video, which is even more impressive than the performance I witnessed. The child is much younger. Also, in the version I witnessed, the bowl was larger and the older assistant held on to the sides of the bowl while here the assistant does not hold the bowl but holds the child and the volunteers are allowed to hold the bowl as they wish.
Can this be explained by science or is the "chi energy" explanation given at the performance the best we have?