As I've noted on previous occasions, Clio is a silly baby. From the very beginning, she's made us laugh. Something about her expressions, her mannerisms, her overall demeanor is just...silly. She loves to giggle, particularly when broad, physical humor is involved. And she's prone to doing random, silly things, like tilting her head from side to side and saying "blah blah blah blah blah" (my best guess is that this is an imitation of me) or spontaneously going into a perfect downward dog. We never taught her this; she just does it. And with such excellent form!

The latest twist on Clio's silliness, however, is not so innocent. It turns out she finds it very, very funny when I say "no" to her. And she finds it downright hilarious to test limits. Por ejemplo: there is a floor lamp in our living room that she likes to grab onto and shake. It's got a pretty sturdy, weighted base, so I don't think she's likely to topple the thing, but still. This is not behavior I want to encourage. So I firmly tell her, "No no, Clio, please don't touch, I don't want the lamp to fall and hurt you, etc. etc." And Clio finds this very funny. She takes her hands off the lamp, smiles, and then holds on again, waiting for my reaction. So I say "no" again. She laughs. I say no some more, and finally she lets go. Then she tries just touching the lamp with one finger, grinning and twinkly-eyed, to see what I'll do.
And my friends, I can't help it: I simply cannot keep a straight face. I try so hard, but eventually I break down. I just can't look at her (That smile! And one finger! That's sophisticated humor!) and not laugh or smile. And I know that this is not helping her learn that when mama says no, mama means it. Granted, I don't think I'd have a hard time staying stern if she was, say, putting her finger into an electrical outlet. But I'd like her to respect my "no's" in general, whether she's in mortal danger or just doing mischevious stuff like throwing her food on the floor or shaking lamps.
What should I do? Should I ignore her when she tests limits? Not look at her when I say my no's? Or do I just need to work harder on my poker face? I will admit that there's also this (weak. weak!) part of me that does't want to show anger or displeasure with her, lest she think that it's not all right to be silly and playful sometimes. I mean, I'm guessing it's pretty tough for a toddler to try to sort out why some things are OK and some things aren't. Why is it all right to stand up in the crib, but not in the bathtub? Why is it OK to throw a ball, but not a cup? It's my job to teach her these things, and hopefully to get her to realize when mama means business. But I suspect it's not going to work too well if I'm giggling the whole time.
Who among us is not powerless in the face of a baby with good comic timing? Help!