Indiana Jones and the Kingdom of the Crystal Skull. The chase scene is on a Harley, but outside the cafe there's a ton of bikes, and for a second a Triumph Tiger or Thunderbird.
Not a Movie or TV show but how about a video game??
http://www.youtube.com/watch?v=cSR2p1aGzSk
There's an Allstate insurance ad that takes place in a shop, and there is a red Bonnie behind the spokesman. The Triumph label on the seat has a piece of black tape over it, but the tank badge is visible from certain angles.
And of course The Wild One. A Triumph Thunderbird. Brando helped sell it in the USA. Forgive me if this film is too obvious. James Dean bought a Triumph Trophy in 1955.
This is a friggin classic.....along with anything Steve McQueen.....
LMT