Funny lies, and lying in general

Congratulations, hush! (She had her baby--announcement is about halfway through yesterday's comments.)

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This is not at all a serious topic, but it seems like I've been hearing about it all over the place lately, so I thought people might be interested. The idea is funny lies you tell your children.

Years ago, one of the moms in my playgroup wanted her daughter to drink soy milk, but her daughter refused to try it until she told her it was elephant milk. It's been 5 years, and I'm still laughing at that.

Have any of you lied to your kids on a scale like that? What did you tell them, and did they believe it or see through you?

A more serious follow-up is asking if it's ever acceptable to lie to a child, even along the lines of an "elephant milk" lie. If so, what are the boundaries you'd draw?

I'm still working through this one myself. I think lies that can never be found out and that help a situation are OK (like saying it's time for bed when a kid is overtired, even if official bedtime is not close). But on the other hand, it does seem to be a slippery slope.

What do you think?