your experience at a restaurant ... & Human behavior

 depends on 

1. restaurant: location, ambiance, seating arrangement, temp., view

2. your tummy situation: full, hungry, not too hungry !, full to hungry; hungry to full

3. mood: interest in eating, specific food in mind not served here, company of people; etc.

4. the food & the service (attitude and smile of the waiter/waitress) 

& 3 out of 4 (above) have nothing to do with the food, or the waiter/waitress, rather very much in your control ... or in other words, you have certainty about it, before you start eating ... 

so goes the uncertainty in your life or markets ... 75% out of window .. just like that.

think about it ..!