I'm not sure I could pick only one. Phasers and photon torpedoes could be helpful in getting the Klingon's off your rear bumper.
Speaking of red shirts - Didja hear about this? http://trekmovie.com/2009/03/04/trek-spring-collection-preview-first-look-at-genki-star-trek-fragrances/ Because Tomorrow May Never Come. The Star Trek Red Shirt Cologne by Genki Wear is made for the young, modern man of the galaxy who doesn't hesitate; who revels in being alive today. Red Shirt Cologne instills confidence, showing the universe your strength, your valor, your devotion to living each day as though it could be your last. Bright, clean, and direct with top notes of green mandarin, bergamot and a hint of lavender, Red Shirt finishes strong with base notes of leather and grey musk. It's a daring men's fragrance for those brave enough to place no trust in tomorrow. -Raj
"Red Shirt" and "Tiberius" colognes, and for the ladies... "Ponn Farr"...Because having is not always so pleasing a thing as wanting. lol, love the product design.