One American, one Japanese and Banta Singh were sitting naked in the sauna.

Suddenly there was a beeping sound.

The American pressed his arm and the beep stopped. The others looked at him questioningly. 

"That was my pager," he said. "I have a microchip under the skin of my arm." 

A few minutes later a phone rang. The Japanese fellow lifted his palm to his ear and spoke briefly into it. 

When he finished he explained, "That was mobile phone. I have a microchip in my hand."

Banta Singh felt decidedly low-tech. So as not to be outdone, he decided he had to do something just as impressive. 

He stepped out of the sauna and went to the toilet. He returned with a piece of toilet paper hanging from his backside.