Are there any bits in caves where the description barely mentions the section that causes you all manor of difficulties or fear? Classic bit for me has to be 4 pots rift in Sludge Pit, I find it particularly challenging and it's not easy if you get halfway through and decide you don't want to do it.. The fear for me in that particular part lies in slipping down to the pots below and getting wedged and as a not very big person it's feels difficult wedging the body through that particular section.

The number grows greater every year (and with every increase in waist size).