Nitrous
The first time I ever experienced nitrous oxide was as a college junior back in the mid-70's. I went to a dentist within walking distance of the campus to have a filling made (it should be noted at the time my hair hung halfway down my back). "Do you want novocaine?" he asked. "Never use it," I replied. He glanced at my hair. "Ever tried nitrous oxide?" Without missing a beat, I said, "No, but I'm game." They laid the nose piece on me and turned on the gas. After a few minutes the nurse came to check on me. "How are we feeling?" I shrugged, not really sure what I should be feeling. She called the dentist over, who looked at some knob or valve out of my view and frowned. They turned away from me and consulted in lowered voices. "Sometimes," she smiled, "If you are a heavy drinker or smoker it takes a little more." I rolled my eyes. She patted my arm. "We can tell." The dentist turned something and ...