Let's here them? If they are not too well known perhaps a photo if you have it would be great.
I can think of a few that I found to be knee knockers and often this did also have to do with the weather conditions (wind). Not in any particular order.
#17 Whistling Straits (Straits Course) - 249 yds - played this puppy into the wind coming off the left. Glad it wasn't the right. But I played the Blues from there it was just a medium length, girly 224 yds into a 3 club wind.
#4 Black Wolf Run (River Course) - 219 yds - and they are calling it a medium length par 3. Honestly?
#7 Pebble - that green seemed rather small - and the Ocean rather large - with Wind force 6 blowing head on.
#16 Cypress Point - 2 club breeze into my face, no need to comment any further.
#15 Kinsbarns - 212 yds wind against from the right.
#13 Muirfield - wind was hard off left to right. Either you draw it against into the middle of the green or hit the beach. I hit a good shot middle of the green that was fading as I couldn't really draw the ball at the time. Caddy said, "you're not much for listening are you?" watched what I honestly thought was a perfect shot given a draw was out of the question bounce, roll right and back down off the front into a huge bunker.
#6 NSW - 177 m - hard wind from the sea, can you say bail right?
# 5 Stonewall Orchard - 239 yds all carry over water.
# 14 MPCC Dunes course - 180 yds wind from the right against and waves crashing all over the place.
I just realized how lucky I've been. Every single round at the above courses was played in sunshine. Amazing since I've only played each of them once. That means conditions can get a hell of a lot harder....wow.
Just realizing a pattern here. Every one of these holes that intimidated me have water in play or in view (perhaps indicating a fear of fish), a few even have trees and bunkers added to the mix. Must be 3 of the things I dislike most about golf courses...