Street name for 3,4-methylenedioxy-methamphetamine, more commonly known as Ecstasy. Called Mitzi's because variants of the tablets were manufactured with a Mitsubishi Logo on them.
Not as dangerous as widely believed as long as you don't abuse it. In 2001 in the UK 56 people died in the UK from estimated 500,000+ tablets consumed each weekend (36 million per anum). Paracetamol caused more than 400 deaths and alcohol related deaths were counted as 5,543. official government figures.
Q: What have you had?
A Two mitzi's and half a gram of coke