DANGER:
Do not accept ride from Ted Kennedy.

Why not? From the wikipedia article:

On July 18, 1969, after a party on Chappaquiddick Island near the island of Martha’s Vineyard, Massachusetts, Kennedy, allegedly intoxicated, a claim which he denies, drove away with Mary Jo Kopechne as a passenger in his 1967 Oldsmobile Delmont 88. According to Kennedy, he made a wrong turn onto an unlit road that led to Dike Bridge (also spelled Dyke Bridge), a wooden bridge that was angled obliquely to the road, and drove over its side, which had no guardrail. The car plunged into tide-swept Poucha Pond (at that location a channel) and landed upside down under the water. Kopechne died, but as no autopsy was performed, precise cause of death is unknown. Kennedy claims he tried several times to swim down to reach her, then rested on the bank for several minutes before returning on foot to the Lawrence Cottage, where the party attended by Kopechne and other “boiler room girls” had occurred.

Joseph Gargan (Kennedy’s cousin) and party co-host Paul Markham then returned to the pond with Kennedy to try to rescue Kopechne. Though there was a telephone at the Lawrence Cottage, nobody called for help. When their efforts to rescue Kopechne failed, Kennedy decided to return to his hotel on the mainland. As the ferry had shut down for the night, Kennedy swam the short distance back to Edgartown.

Kennedy discussed the accident with several people, including his lawyer, before he contacted the police.

The next morning (July 19, 1969) the police recovered Kennedy’s car. Kopechne’s body was discovered by diver John Farrar, who observed that a large amount of air was released from the car when it was righted in the water, and that the trunk, when opened, was remarkably dry. These observations and others have led some to believe that Kopechne had not drowned, but suffocated in an air pocket within the car.

The incident quickly blossomed into a scandal. Kennedy was criticized for allegedly driving drunk, for failing to save Kopechne, for failing to summon help immediately and for contacting not the police but rather his lawyer first.

Kennedy entered a plea of guilty to a charge of leaving the scene of an accident after causing injury. He received a sentence of two months in jail, which was suspended. An Edgartown grand jury later reopened the investigation but did not return an indictment.

Kennedy’s critics and political opponents question whether justice was served in this case. The case resulted in much satire directed against Kennedy, including a National Lampoon page showing a floating Volkswagen Beetle with the remark that Kennedy would have been elected President had he been driving a Beetle that night; this satire allegedly resulted in legal action by Volkswagen complaining of unauthorized use of their trademark.