[Passed along by the editor's mother-in-law, who has no email]
Three pregnant women were knitting sweaters for their soon-to-arrive babies, and chatting.
The first one said to the others, "I'm taking folic acid, so my baby will be healthy and have a robust immune system."
The second said, "Oh, I'm taking lots of calcium so my baby will be strong and grow tall."
The third said, "I'm taking Thalidomide."
The others reacted, of course, with horror. "Thalidomide! Why would you take that?"
"Because I don't know how to knit sleeves."