The 1982 Chicago Tylenol murders.

Someone, or a group of people, slipped cyanide into Tylenol bottles.

In the space of just two days, seven people died.

Johnson and Johnson made a voluntary nationwide recall of all Tylenol products.

It cost them a lot of money, but the move is widely credited with saving the Tylenol brand, and is a public relations legend.

It's THE REASON we have safety seals on pill bottles now, by the way.

Sadly, those responsible were never caught.

The 1982 Chicago Tylenol murders.

Someone, or a group of people, slipped cyanide into Tylenol bottles.

In the space of just two days, seven people died.

A nationwide recall of all Tylenol was made.

It cost them a lot of money, but the move is widely credited with saving the Tylenol brand, and is a public relations legend.

It's THE REASON we have safety seals on pill bottles now, by the way.

Sadly, those responsible were never caught.