And if such things go wrong there are bound to be tears in Braehead this weekend as an onslaught of wannabe stars face the X Factor judges.
Simon Cowell and co will be working their way through thousands of hopefuls on Sunday afternoon at the arena.

To help out any readers planning to join the queues, The Extra picked up some last-minute hints from vocal coach Annie Skates – who has worked on the show.

Although it may sound obvious, Annie believes that too many people still make the wrong decision when choosing a song.
She told The Extra: "A lot of men try and sing Angels by Robbie Williams but when they reach the chorus they run into trouble trying to hit the high notes.
"Know your range and pick a song which shows your voice to its best advantage, rather than over stretching it.
"And try and choose something a little different rather than the obvious numbers.
"The judges hear the same things over and over all day – so anyone who does something unusual will stick in their minds".

Even those who do pick the right song can also fall into traps if they don't put enough time into preparation.
Annie explained: "You have to know the song really, really well. "Nerves tend to make you forget words, so you need to have them firmly planted in your mind".

Taking care of yourself is also vital. A hot bath and early night before are Annie's "winning combination".
She said: "The steam from a bath is really good for the voice – it warms your vocal chords and also clears the throat which is great for singing".

Taking care to warm up your vocal chords can help stop the ultimate disaster – a sore throat on audition day.
Annie said: "Sometimes if you've been rehearsing a lot or are nervous this happens. But try to relax.
"A throat spray like Vicks ultra chloraseptic is really good because it will calm everything down and take the pain away.
"But don't take anything right before the audition – because you can't sing with a numb throat".