Um, yeah. So this happened, according to Time:
The memorial service today for Nelson Mandela, the former South African president who died on Dec. 5 at age 95, was a four-hour affair. At some point, Danish Prime Minister Helle Thorning-Schmidt posed for a photo with her seat-mates: U.S. President Barack Obama and U.K. Prime Minister David Cameron.
At least Michelle had the good sense to act right.