Natural gas:
1. Colorless
2. Odorless
3. Tasteless
According to a story a teacher told me in school (it has to be true) This was found on a blackboard in the remains of a school reduced to smithereens shortly after it had the new natural gas installed and was the impetus for adding scent to the gas. I never bothered to see if this was true.
The same teacher also told us in chemistry class that "Alcohol and gasoline don't mix. Actually, they do mix, but they taste terrible."
Well I'll be darned! Although the blackboard had other things written on it, still gas related and ironic.