Straight A's

We were having the discussion of straight A's with the kids and they were very interested in whether we made straight A's. B said he did mostly make A's but he did get some B's and J said, "Well, if you can't make straight A's then you can't be in high school." Okay, you have to think literally here. He was thinking if you can't write straight A's then you can't move on to high school. K thought that was funny and she laughed at him. B put her on the spot and asked her what straight A's meant and she said, "Well, if you cheat you aren't making straight A's." So that whole conversation was over their heads although they sure thought they understood.