Not the end of the world, but when you've literally got thousands of fans waiting for you to perform and you're running late, the pressure would surely be a little overwhelming - as Sia experienced.
In fact, the stress of the situation became so much it gave her "crazy diarrhoea", as she tweeted to her 3.6 million followers.
Still pushing to get to the venue she kept her fans updated.
Her fans went absolute nuts over her dedication.
One user tweeted, "Omg it's not called diarrhoea anymore but Siarrhea from now on".
Her fans continued to assure her.
One wrote, "Don't worry Queen, we would wait the whole lifetime for you".
While another said:
Sia made it to the venue and finished her concert with a deafening cheer from the crowd.
You go girl.