funny you should mention that bill,
that happened to me when i went on an investigation at Kielder Castle, we had paired off into twos to search different areas of the place and i was paired with a guy named mark (if i recall correctly ).
It was pitch black and he was filming in nightvision and i was calling out when i got prodded in the bum.
At first i was frightened to ask if mark had poked me as i felt embarressed but then it happened a second time so i had to ask lol.
we both howled with embarressment when we realised he couldnt have possibly have moved his hands without me knowing as he was holding all the equiptment and filming, so yeh, i was poked by something we couldnt see xxx