4 & 5) Perth and Stirling. These two are on my list for the same reason, because of an incident a bit over a year ago which had me being threatened with an enforced visit to one of these stations instead of my intended alighting point from that service at King's Cross, which would have left me stranded quite a few miles from my hometown. I'm not going to go into any more detail here.
3) Entwistle. Aside from being a remarkably uninteresting station, due to it being a request stop served by units with no gangway connection, I have had a number of incidents of missing this station by jumping in the first available door at MCV, which, unfortunately for me, tends to be into a 153 which is coupled to a 150/1.
2) Belvedere. London Challenge 2013. Enough said really.
1) Lostock Gralam. This station in rural Cheshire had the a bus bench as facilities the last time I used it (about 3 years ago now). Unfortunately for me, the last train out towards Manchester had been cancelled, and because of the lack of information system, I didn't know that the train was cancelled, and also didn't know if there was any replacement transport, and so had to spend a lovely chilly night in mid-January freezing my backside off because I had no alternate means of getting home. This incident was made worse by the guard on the first train out the next morning attempting to charge me for a SDS from Lostock Gralam to Navi Road (my intended destination) because I had not taken the replacement bus from Lostock Gralam that I hadn't been told about.