"Boy, you have your hands full!"
"Do twins run in your family?"
"Are they identical?"
But yesterday, at the market, I heard two new ones. In the canned food aisle, an elderly lady smiled and asked, "Twins?" "Yes," I answered, waiting for the inevitable mention of their adorable-ness. "That's painful," she muttered, and walked away.
The second comment was from the teenage bagger at the checkout line. As he was packing away my produce, he inquired, "Are you making sure they are getting all of their vitamins and minerals?" Huh? Would someone ask this of a mother with only one child?