What Was I THINKING???

Be forewarned, this is going to be a bit gross....
A few days ago, Lola came up to me and, out of the clear blue sky, tells me that she didn't eat her mocos. Now, I know better so I'm suspecting she did actually do it. Then this little fib flies out of my mouth: "You know, Lola, if you eat mocos, a mocos tree will grow in your tummy". I don't know why I said this, except for the fact that when I was little, my mom had told me that an apple tree would grow in my tummy if I continued eating the seeds of my apples. But I know my daughter well enough to know that she is extremely literal and very sensitive. I was totally joking and for a few days she didn't really talk about it so I thought maybe she realized it was just a joke.
Then, today, we were driving back from getting fresh eggs from a friend's house and it's a pretty rural area. There's trees everywhere. Lola is talking non-stop in the back seat, like usual. I'm pretty good at listening to everything she says (as much as I would love to be able to tune her out sometimes!) because, like I said earlier, she's very literal and takes my responses very seriously so I have to make sure I respond accordingly...Anyway, the area we were driving in is unfamiliar to me so I'm trying real hard to concentrate on the road and I ended up effectively tuning her out, but I can hear that she's going on about a tree. I'm doing the "umm", "uh-huh" responses, but then she starts getting really upset and begins crying hysterically!
That snaps me back into reality and I'm trying to figure out what the hell she's so upset about. All I can hear is "tree" and nothing else makes sense! I'm looking frantically at all the trees around!
This is what I get for not listening...It turns out I had agreed that there was, indeed, a mocos tree in her belly and that it was so big, it would never be able to come out.
Sheesh!!!! I told her that mommy just made a bad joke...I managed to convince her, finally, that there was no tree in her tummy and all was well.

Last time I do THAT!