And suddenly, we feel this tap on our shoulders and we look back, and lo and behold who is it.
The free Who Is It app customises this functionality further, so the light blinks in one of three colours for up to three different people.
O'Connor: The jury is still out on how addictive it is, there are some who say it is very addictive, but others say it's not.
But if (Real coach Bernd) Schuster wants to keep a player who is unhappy it is his responsibility.
As with organic food, the Fairtrade movement is under attack both from outsiders who think it is misguided and from insiders who think it has sold its soul.
But what about sending them an NFC key that is valid for only a few hours, that alerts you when it is activated and who is using it?
Because if we do those things, not only is it good for the people who find work, not only is it good for families who are able to pay the bills, but it actually is one of the most important things we can do to reduce deficits and debt.
WHITEHOUSE: President Obama Holds a Press Conference on the Economy
Now, consumers are being asked to use the experiences they have had to identify who is getting it right and who deserves recognition.
What is interesting about this meeting is, first of all, where it's being held in Caracas, Venezuela, and who is hosting it, Venezuelan President Hugo Chavez.
"A lot of it is women who, because it is difficult to get on, subjugate their own ambition into their kids, " she said.
BBC: British children 'babied' by intrusive parents, says MP
"When people are slapping badges down, reading rights and monitoring who is calling who as it relates to career people, it is a mistake, " Steinberg was quoted as telling his agency's investigators.
David Manning, who made the trip from Reading for the opening match, is one fan who believed it is a historic occasion.
Like any brand that has lost its way, the GOP needs to clearly establish who it is and what it stands for.
FORBES: The Republican Party Has A Brand Problem, And We Have The Evidence To Prove It
"I won't say who it is, but it will become public next week, because he'll be working with Lee for a few days at the Barclays tournament, " said Chandler.
Remember that no one knows what it requires to do the job more than the person who is doing it.
FORBES: Ask Your Employees What They Need Before Your Business Begins to Fail
And it's the friend of Interpal's managing trustee who is leading it.
Those who think March 15, 2012 is a Thursday and those who know it is the beginning of the most exciting four days in American sports.
Third category: This is he who studies it because he believes it is permissible or wants to make it permissible (under Islam).
"You do not know if it is a lobbyist or a businessman or who it is, " he said on the House floor, in a bid to water down new restrictions on gifts to House members.
"One side couldn't attack the other side without the side being attacked knowing who it is and from where it came, " says retired Vice Adm.
Now the person who needs monitoring is the person who is trading, whether it is a buy-side trader, an asset manager or a hedge fund.
FORBES: Monitoring Traders Trade: Sell-Side, Buy-Side or Asset Managers
An especially good or bad sentiment can be impactful regardless of who is behind it.
FORBES: The Potentially Huge Market In 'Future-Tense Analytics'
On past experience, Ofcom will only be as good as the person who is running it.
The significance lies not just in what is being said, but who is saying it.
The blueprint was inherited by his daughter, who is putting it up for sale.
BBC: NEWS | UK | Northern Ireland | Titanic blueprint to be auctioned
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