When I was in college, we had issues with the oscilloscopes in our electronics lab. They were sensitive enough to register body movement nearby with no physical

When I was in college, we had issues with the oscilloscopes in our electronics lab. They were sensitive enough to register body movement nearby with no physical contact. This was about 20 years ago. Think they were HPs... It wasn't really a problem; we only noticed because we couldnt get a signal out of our circuit due to a busted internal lead connection, but we noticed the changes as people walked past. Was curious.