Veteran U.S. TV presenter Regis Philbin was left red-faced after jumping on the back of David Letterman's scooter following their interview on Thursday (17Nov11) and falling straight off.

The 80 year old's stint on his daytime chat show Live With Regis And Kelly comes to an end on Friday (18Nov11) after 28 years on air.

He was a guest on Letterman's nightly programme on the eve of his retirement, and the pair decided to ride a red Vespa through New York after their chat.

However, Philbin - who was riding on the back behind Letterman - tipped the bike and went flying to the floor.

The star quickly jumped to his feet to inspect the damage to the vehicle, and his representative insists Philbin didn't suffer any injuries.

Philbin's daytime hosting duties began in 1983, with a local New York TV programme called The Morning Show with Cyndy Garvey as his original co-host.

In 1988, it was reincarnated with actress Kathie Lee Gifford, and became Live with Regis and Kathie Lee until 2000. Kelly Ripa joined as Philbin's co-host in 2001 after Gifford's departure.