1. Does this make your stomach turn?
2. Does this make your bum clench?
3. Do you imagine slipping forward and plummeting to the ground?
4. Does the thought of opening your front door onto that feeble slice of pavement above a gaping abyss make your palms sweat a bit?
5. Does the sight of this old man on his wibbly-wobbly chair make your feet feel tingly and strange, not in a good way?
6. Does your mind continue the somersault so that he tumbles into the void, and plunges headfirst towards the concrete below?
7. Are you imagining the precise, desperate feeling of hanging there by your weak little finger tips, which are losing strength with every passing moment?
8. Do your hands and feet ache in a horrible empty way at the sight of this?
9. Does this make you clench your jaw?
10. Would you stand that close to the edge?
11. Is this just about the worst thing you've ever seen in your life?
12. If these images make your stomach turn, you've got acrophobia – otherwise known as a fear of heights.
13. And honestly, it's fair enough. Heights are terrible things – look at this one.
14. They have a power to them – like they could suck you over the edge.
15. This is an insane place to take a selfie.
16. An acrophobic person would not be able to watch this happen let alone do it.
17. Because you're more than likely acrophobic, you feel sick watching this guy stumble on this bar.
18. So, OK, not every human on earth has acrophobia – this guy doesn't.
19. Most of us common or garden acrophobics would not want to cross the Bridge of Nope.
20. As if this ledge wasn't bad enough... it's not a ledge, it's an inch-wide piece of metal.
21. Us acrophobics would never find ourselves perched on the top of this needle-like rock, 1000s of metres above the safety of the ground.
