Torture-Worst You Can Imagine.

This always creeped me out. Just going to copy paste from wikipedia:

Scaphism, also known as the boats, was an ancient Persian method of execution designed to inflict torturous death that was described by the Persians' archenemies, the Greeks. The name comes from the Greek σκάφη, skáphe, meaning "anything scooped (or hollowed) out".

The intended victim was stripped naked and then firmly fastened within the interior space of two narrow rowing boats (or hollowed-out tree trunks) joined together one on top of the other with the head, hands and feet protruding. The condemned was forced to ingest milk and honey, and more honey would be poured on him to attract insects, with special attention devoted to the eyes, ears, mouth, face, genitals, and anus. In some cases, the executioner would mix milk and honey and pour that mixture all over the victim. He would then be left to float on a stagnant pond or be exposed to the sun. The defenseless individual's feces accumulated within the container, attracting more insects which would eat and breed within the victim's exposed flesh, which—pursuant to interruption of the blood supply by burrowing insects—became increasingly gangrenous. The individual would lie naked, covered from head to toe in milk, honey, and his own feces. The feeding would be repeated each day in some cases to prolong the torture, so that fatal dehydration or starvation did not occur. Death, when it eventually occurred, was probably due to a combination of dehydration, starvation, and septic shock. Delirium would typically set in after a few days.[1]

In other recorded versions, the insects did not eat the person; biting and stinging insects such as wasps, which were attracted by the honey on the body, acted as the torture.

Chemical torture. Stuff like Gabazine - Wikipedia, a benzodizepine receptor antagonist.