They're saying their sacred wedding vows in front of family, friends, and a videographer. Then the groom reaches out and slaps the bride! He wasn't thinking of how it looked -she had a bee on her face. He was just thinking of her safety.
The poor groom then realized what it looked like, and knows he'll never live it down. Luckily, the officiant saw it, and let everyone know what happened. A good time was had by all. -via reddit