Turbulence is always disconcerting if fortunately rare. It was particularly bad coming into Heathrow one day as the Skip was rapidly on the p.a. "As you will see we've been through some turbulence, nothing too serious". Reassured this SLF.
Not really scary but I remember missing an approach at Kai Tak. The crew were too far busy for a p.a. announcement (believe me it makes a difference) & we landed successfully in the opposite direction a few minutes layer but I had visions of ending up in Kaohsiung.
Also its off putting seeing a plane pass nearby at the same level. Actually we wern't, Both were in the stack at different levels and banking, almost you could say an optical illusion, but I wasn't thinking that at the time.