Saturday morning Sheba and/or Nina picture

There's a bed-of-roses / bed-of-Fittonias joke in here somewhere, but my brain keeps going to "I beg your pardon / I never promised you a rose garden" instead, which is especially weird because that's an old country-and-western song and those are the only two lines I know and I'm not even sure how I know those. So I can't find the joke, is the point. But I know there's one in there somewhere.

[shaking fist toward sky] Okay, brain, you win this time. But I'll be back!