A pregnant woman and her husband walk into a glasses shop and sit down. She struggles over her large belly to grab the glasses, but once she puts them on she looks over and sees that now her husband has the large pregnant belly and hers is back to being flat. They both then get up and walk away, the husband now struggling. The line is "Unless the glasses can perform miracles, don't pay more than you have to." The miracle here being that the husband is now the one who is pregnant.