Check this one out...
I know what FISHAWAYS is TRYING to do, but they're not doing a good job of promoting THEIR vegetables, now are they?
Sigh. If you don't get it, think about it. "You'll actually want to eat YOUR vegetables". Get it now?
Okay, so I've added some selective emphasis but it helps to illustrate the concept. There are enough grammatically challenged people out there to read it the way I've emphasised it. And for me, if it's not 100% clear, then it's not a good advert, unless maybe they've intended it to be ambiguous, but in this instance, they haven't.