The Jamie Effect refers to the act by restaurant staff of putting Jamie Cullum music to cause a change the tempo/mood of the night causing people to ask for their bill and leaving the restaurant. Jamie Cullum effect doesnt work because the music is bad but rather due to it amazing ability to cause a mood change/ tempo change within the restaurant instantaneously. The Jamie Effect is used by the restaurant staff as a polite method of indicating to the remaining customers that it is now time to leave.
"hey man time to jamie it up"
"jamie effect strikes again"
"we need to jamie it up asap"
"oh man the jamie effect isnt working tonight, its too loud in here"