The Phoenix in Broughton St in Edinburgh opened at stupid o'clock as well. I was going fishing one morning and walked past about 5.30 ish and there were guys outside banging on the door to get in....dunno if they were out late or starting early!
There are a few others, the Old Salt, used to close for an hour a day for cleaning, everybody got emptied out onto Leith walk and stood about till it opened again!!
Jaynes as well, used to pass that on my way to work....kareoke going full swing at 06:30, people on tables etc......
Worst one I've been in is the Sackville Lounge, on the north side