Intravenous Injection of Chemotherapy. It is very common for chemotherapy medications to be injected into a vein, or intravenously. In many cases, a nurse or doctor will insert a needle into your vein, often in your hand or arm, and the chemotherapy will be given through there.
The Inland Taipan is the most poisonous snake on land, and arguably the most poisonous animal in the world. Keep your distance. 4. Blue-Ringed Octopus. If you enjoy swimming in the Pacific Ocean off the coasts of Australia & Japan beware of the Blue-ringed Octopus, considered to be one of the world's most toxic animals.
The bark is poisonous too -- burning it releases a smoke that causes temporary (and in some cases, permanent) blindness. Considering all the ways it can hurt you, it's no wonder the manchineel currently holds the Guinness record for world's most dangerous tree. Legend has it that one of the most infamous deaths by manchineel poison was of Spanish conquistador Juan Ponce de Leon.