If you are reading this article in a public place, maybe you're enjoying a coffee or a bite to eat, it may be worth checking around you to see if Maria Sharapova - or any other sporting star - is watching you. She might well tweet a picture to her million-strong following.
That's exactly what happened to one unsuspecting passenger on board an aeroplane the other day.
Sharapova tweeted a picture of a man reading an Asian newspaper article about the superstar herself and posted an accompanying message: "Hey buddy, I'm right behind you... :)"
For the mystery man, if he had have turned around - we know nothing about whether Sharapova revealed herself - it would have been a massively surreal experience, I guess you wouldn't usually expect to bump into one of sport's most famous stars.
The Russian beauty must have had this happen to her before, however. The 27-year-old is a five-time Grand Slam champion and has articles written about her all of the time. She has become a household name for her blossoming career on and off-court.
Aside from winning Wimbledon as a teenager and staying around the top of the world rankings more-or-less throughout her time as a player, Sharapova has made a fortune for her modelling work, fashion lines and business ventures.
When you consider her amazing wealth, it makes the tweet all the more strange. It appeared as though she was sat in economy class. When you're worth millions its not often you sit in economy, perhaps her confectionery company 'Sugarpova' has had a tough week.
She's had a fairly good year too. The former world no.1 bagged her second French Open crown earlier this summer by defeating Simona Halep in the final, although she couldn't repeat the trick at Wimbledon or the US Open.
In fact, like many top stars, Sharapova has enjoyed something of a break from action since Flushing Meadows as some free-time in the busy calendar became available.
The world no.4 made her return in China this week, however, at the Wuhan Open. She brushed aside two-time major winner Svetlana Kuznetsova in her opener but was defeated in the next round by the lowly-rated Timea Bacsinszky in straight-sets.
Another tournament in Beijing lies in wait before the season-ending WTA Tour Finals in Singapore, something that Sharapova has already qualified for.
Expect the Russian to take another luxurious holiday after finishing in Asia, the next Grand Slam doesn't kick-off until 2015 in Australia.