A Proper Engagement Congratulations
When your friends get engaged and you feel that the only appropriate way to say "congrats!" is to give groom and rough hand job (this is on the spot, so you don't have the proper lubrication handy) and a pack of camel lights because they're only likely to enjoy sex until they tie the knot and their lives devolve into a spiral of depression and dissatisfaction.
Hey man, congrats on proposing to your gf! Pull down your pants so I can give you a proper engagement congratulations. Here's a lighter!