and other tales of desperation
The Groupon deal with a purposeful MPREG (male pregnancy) joke. There's a banner on the Occasions section that continues the theme. Notice the pregnant man reflected in the mirror on the right? I like that Groupon was trying to be funny, but I admit that unless you get the joke it looked more like a fail on their part.
I would say that the majority of people probably only read the email subject line, but good on Groupon for keeping us on our toes!