1) If there is ever a drought...
2) If (or when) your parents catch your stash -- because they almost always find your pot at some point in time, whether your thirteen or thirty years old - it doesn't matter, they'll find your sizzle somehow/someway.
3) If you get robbed
4) If the cops confiscate your MJ
5) If your girlfriend breaks up with you and takes the kids...and the weed
Ant: Duuuuuude, don't worry, man. I have my emergenweed at home.
Jay: Sweet. Let's smoke some weed.