Carl claims people are accidentally getting their jab intravenously instead of intramuscularly which is leading to more severe reactions. This is bull. An IV injection would have to be very deliberate because you have to get the tip of the needle inside the vein. The same way the doc gives you an IV or an addict has to hunt for a vein.

He's correct on this point. Most syringe-wielders don't aspirate - they don't pull the plunger back to ensure that no blood appears (i.e. hit a vein). So around 1in 1000 get a direct hit in a vein, metallic taste in the mouth and then BAM.