National Lampoon's Christmas Vacation star Chevy Chase, 80, sparks concern in wheelchair after health scare

National Lampoon's Christmas Vacation child star reveals surprising secrets behind the beloved holiday movie - from what it was REALLY like to work with Chevy Chase to the 'graphic' scene you NEVER saw

Chevy Chase, 80, FALLS OFF STAGE at National Lampoon's Christmas Vacation event after arriving onstage in a wheelchair - one day after insisting he's in 'amazing' shape

National Lampoon star Chevy Chase, 80, breaks his silence on health fears - insisting he's in 'amazing' shape - after he was seen in a WHEELCHAIR while supporting pal Sylvester Stallone at Philadelphia event