more fun with advertising

Driving up I-880 in Oakland, a few miles before the 980 interchange there's a huge billboard that reads:

"I scream, you scream, we all scream for green beans"

This, from the highly intelligent and well-schooled marketing division of Kaiser Permanente. Apparently a degree in marketing does not require any grammar or literature, retroactive to kindergarten, otherwise they might have stumbled across the extremely obscure literary convention known as rhyming.