Book

• Get the happy couple a book instructing them on the finer points of marital relations. Books like the "Kama Sutra" or "101 Nights of Grrreat Sex" can give the couple some laughs while also giving them some ideas for their newlywed years. Go sillier with books like "Tickle his Pickle" or a goofy variation on the Kama Sutra like "The Snuggie Sutra."
  
  

Survival Kit

• A survival kit for an engaged couple consists of teasing items like aspirin, a sewing kit, a coin for flipping during arguments, gift certificates for a massage or dinner and a movie. A stress ball or a blow-up punching bag also makes a good addition to survival kits. You can put the kit together yourself or purchase a premade kit at a gift shop.
  
  

Funny Messages

• T-Shirts, towels and pillows with a funny message for the bride and groom-to-be makes a good gag engagement gift. T-shirts that say things like "Game Over" can be funny if the bride and groom to be aren't easily offended. A coffee mug with a wedding band. Shot glasses with little drawings, like one person catching another with a giant magnet, are silly and humorous as well.
  
  

Cake Toppers

• Gag toppers for the wedding cake celebrate upcoming nuptials while poking fun at the wedding itself. Cake toppers can feature the bride holding the groom in place or the groom stepping on the bride's train to keep her from running off. For something a little cuter, a gag cake topper can consist of the happy couple making out or the bride's leg wrapped around the groom. Another gag topper shows the bride threatening the groom with handcuffs.