Arbor Day Foundation Puns

My family is on the mailing list for the National Arbor Day Foundation, so we get begging letters from time to time.

In the most recent one, there was an additional flier that had the phrase "Hurry! You don't want to leave behind all the great benefits of being a member of the Arbor Day Society!"

I was immediately disappointed that they didn't say "You don't want to LEAF behind..." I then got SUPER excited to tell this joke to my wife who was in the other room, so I run in to tell her the joke, but by that point, I was so jazzed about the leaf pun, I completely forgot the rest of the phrase, so all I could babble out was (and this is literally what I said) "Something something LEAF! Something something something," all the while giggling like a madman. I have not heard the end of it.