Avocadro's Time
The shortest time in physics: the time between when an Avocado is unripe to when it is overripe. Avocadro's Time is the fleeting moment when the avocado can be eaten and enjoyed. (That moment is known in physics as Avocadro's Number and is defined as (6.62 × 10^-34)^(6.62 × 10^-34), and is equal to one Planck's length of a Planck's length.)
Dude, I bought six avocados yesterday and I missed the Avocadro's Time. They're rotten. I wish I knew Avocadro's Number so I knew when to eat the damn things.