Why do people not join in when you laugh at yourself?

It’s taken me sometime to be able to laugh at myself when silly and unfortunate things happen to me in public. However i have got there and rather than feel all embarrassed i can now chuckle at the ridiculousness of some thing s that occur.

Take for example this morning when i was at the checkout ready to pay with my £2.99, when in classic style of a nonse went to hand over my change to the cashier and the money (literally) flew out of my hand….it went….EVERYWHERE!

It was highly embarrassing! But i decided not to get hung up about it and simply laugh….and yet…no-one laughed with me….

I’m thinking that :

a) people were just so annoyed at having waited in the queue so long that they would not find anything amusing
b) people were embarrassed for me and therefore did not want to laugh as they might seem to be laughing at me
c) people are so wrapped up in their own worlds that they did not even notice what was going on around them…. or
d) I am missing some very obvious explanation….

Either way – would you not rather that people laughed with you that staring blankly at you like you are a wally!?