So I was watching Linkara from That Guy with the Glasses
.com review Lady Gaga. There was an instance in the comic where a music snob got into Lady Gaga after watching a music video on TV. Soon, he begins to see people with Lady Gaga t-shirts, people who talk about Lady Gaga... Linkara reacted to how weird it was that he began to see Lady Gaga everywhere after he just began to know her.
What Linkara probably didn't know was that the main character was going through a "Baader Meinof Phenomenon".
Copy-pasted from this side: http://monkeyfilter.com/link.php/12111
"Baader-Meinhof is the phenomenon where one happens upon some obscure piece of information– often an unfamiliar word or name– and soon afterwards encounters the same subject again, often repeatedly. Anytime the phrase "That's so weird, I just heard about that the other day" would be appropriate, the utterer is hip-deep in Baader-Meinhof."
It could be really oscure things, like Baader-Meinof itself which was a terrorist organisation in Germany back in the 70s. Or more obvious things like The Rolling Stones. If you just found out what it is, you begin to see it everywhere, like the rolling stones logo that starts appearing everywhere.
I don't know if this appear in other media and I don't have any scientific explanation, yet. But it's probably sociological.