What could possibly go wrong when proposing to your girlfriend in public?
You have the ring. Check. You have a crowd putting pressure on her to say yes. Check.
You have even thrown in a guy accompanying you on guitar while you sing a love song with her name in the chorus. Double check.
Now all you need is the bit when she says 'yes' and everyone starts cheering and clapping.
But it never happens. In fact, rather than accept, she actually runs away after saying 'I'm sorry'.
So now you have the awful feeling that your girlfriend does not really love you at all. Check.
In fact, you have the feeling she has probably wanted to end your relationship for a while now but has just not had the guts to tell you. Check.
And now you want the ground to swallow you up as you realise you have just made a complete arse of yourself in public. Double check.