Louise Lear got the giggles at the most unfortunate time: when she was live on air, attempting to read the weather forecast.
The BBC weather presenter couldn't hold back her laughter as she tried to present the forecast on Wednesday.
Thankfully, her giggle was so infectious that viewers have seen the funny side.
It was Simon McCoy who introduced her segment, but he has denied provoking the giggling fit.
So what was it? We may never find out.