Mobile Telesystems wanted to get the word out about their 4G speed being superior for mobile internet browsing. They did so in a way that attracted a lot of attention. They asked well known hot Russian models to post photos on their Instagram feed and hashtag it with words like #oily #hot #naked, #experimenting etc.
The only problem was, the ads were stuck in a perpetual state of near-download. Two hours later, after enough exasperated comments flooded in, MTS uploaded a video featuring a 4G ad, explaining the trick, and telling people to switch to 4G.
Whereupon, a few million sexually frustrated and very pissed off Russians promptly dropped MTS and switched to a competitor.
Okay, I made that last bit up, but I wouldn't be surprised. Very nice prank from BBDO Russia.