Because of its resemblance to the handlebars of a motorcycle or bicycle.
He has a "handlebar" moustache.
Tom Martin Is known for the handlebar mustache in the Heineken commercial in 2011.The handlebar mustache has always been popular in a males eyes it's been a style for centuries.
Rollie Fingers
Rollie Fingers
Wilford Brimley
Salvador Dali. There are a few famous artists who sported the handlebar mustache. The most famous artist to do so in recent times is probably Salvador Dali.
It is from Suite #2 for a Jazz Orchestra by Dmitri Shostakovich
Tom Martin is the actor in the handle bar moustache commercial
Tom Martin is the name of the actor in the moustache spot.
Update: Incorrect information given below. Paul Marcarelli does not have a handlebar mustache, and looks completely different than the gentleman asked about in the above question. Furthermore, Paul Marcarelli was not featured in the commercial that the question was referring to. His name is Paul Marcarelli here is his wiki link http://en.wikipedia.org/wiki/Paul_Marcarelli <---not correct answer! jude munn
Mustache
It is called a "barbiche" in french.