Hindsight is 420
A phrase to console someone who regrets not bringing their weed to a get-together.
Gair: "Bruh you usually look faded by this time on a Friday, what's up?"
Mikel: "Man I thought this was gonna be a sober thing so I didn't bring my herbs, now I'm looking back wishing I had come prepared."
Gair: "Damn that's why your eyes look so clear - your hindsight is 420."