Pregnancy class

A couple attend their very first pre-natal class. The instructor asks the husband to wear several bags of flour under his shirt, so that he can "get an idea of what it is like to be a pregnant woman". After wearing it throughout the class, he tells the instructor "hey, this isn't so bad". The instructor then drops a pen and asks the husband to pick it up. The husband asks the instructor "you want me to pick up the pen just as my wife would do it?". "Absolutely" replies the instructor. The husband turns to his wife and says "darling, pick up that pen for me"/