Everybody knows laughter is infectious – no more so than bus passenger Linda Kane, whose hysterical giggling for no apparent reason has become an internet hit.
Mobile phone footage, which was taken by Ryan Warburton and later uploaded to YouTube by Aaron Winfield, has attracted almost 15,000 views.
And the clip also caught the attention of Forth One DJ Grant Stott, who tracked down laughing Linda.
She explained her starring role came after a “girlie lunch”, adding that she was not chortling at anyone or anything in particular.
Internet sensation Linda said: “It was a ‘had to be there’ moment. I’d been out for a girlie lunch at Alexander Graham Bell on George Street with a few of my friends.
“We had a really good time and when we got on the bus we thought – just to finish it off, we’ll go up to the pub and have another few sherries . . . as you do.
“We were just having a laugh about the day. Then a guy got on and he was really funny, he was having a few sweeties and munchies – and you know when you’ve had a few drinks you get the munchies?
“So we were saying ‘what have you got in your bag?’, we were just having a laugh.”
She added: “I looked as if I was on my own and I was an absolute nutcase – I wasn’t laughing about anything in particular, I was just reminiscing about the day.”
Linda – who admitted her children were mortified at the footage – said she had no idea she was being filmed.
But she added she did not have any problems with the video going viral.
She said: “My motto is ‘a day without laughter is a day wasted’.”
The footage is among a series of bizarre incidents in the Lothians to have taken the internet by storm in the past few days. On Tuesday morning, a picture of a bin on Leith Street overflowing with pizza dough went viral.
And a snap of a Prestonpans teenager covered in his own vomit after taking part in the NekNomination drinking craze was shared on Facebook more than 57,000 times within hours of being uploaded.
Linda will now be able to travel by bus until her heart’s content after her new-found fame earned her a free week-long travel pass from Lothian Buses.
A spokesman for the firm said: “We were made aware of the video soon after it went viral. Like everyone else on her bus, she made us all laugh out loud, so we decided to offer her a week’s free travel as a small token of appreciation.”