Step 1: Get: Lots of ketchup, a fake gun, some old clothes, a massive credit card bill and a really bad quality camera (hence the ketchup - fake blood here would be silly). alternatively, you can choose a black and white camera and use chocolate sauce instead of ketchup. This is your choice. Personally I favour the black and white with chocolate sauce because it gives it that extra feeling you've actually died, and you possibly died sometime ago. (before the invention of color)
Step 2: Then: Fake your own suicide! Your work buddies/classmates would never be more delighted and surprised to see you back in one piece in about a week or two.