Pufferfish

During World War II, the Japanese Empire devised the "Fugu Plan" to resettle Jewish immigrants in Manchuria, hoping their capital would develop the region. In reality, most who arrived were impoverished refugees, and the plan failed.

Pufferfish venom blocks sodium channels in nerves, while monkshood venom activates them. Because the two poisons work in opposite ways, taking them together delays their effects. In 1986, a murderer in Japan exploited this principle to delay the time of death and fabricate an alibi.