I can't imagine a more unpleasant way to go. This poor oleander aphid (Aphis nerii) has its innards sucked out by a hoverfly larva.
photo details: Canon MP-E 65mm 1-5x macro lens on a Canon 20D
f/13, 1/250 sec, ISO 100
MT-24EX flash diffused through tracing paper
levels adjusted in Photoshop.
Yup, that's got to rank high on the Unpleasantness Scale.