This probably isn't the most embarrassing thing I've ever done but it happened very recently so I might as well post it.
I passed my driving test a couple of months ago. The other night I was driving in Manchester city centre. Usually when I'm heading into town I come through via Reddish and Gorton and park up behind the Tobacco Factory on the edge of the Green Quarter, near Angel Meadows.
But I was heading somewhere right in the centre of town on this occasion, so I decided to go via the A6 and come up Great Ancoats and park in the Northern Quarter. Pretty quickly after turning off Great Ancoats I got stuck in a one-way system I didn't know very well, and I was holding up some traffic behind me, so I just took my first left into order to get out of the way.
Turned the wrong way straight into a fucking one-way road that's also a cycle lane. Three cyclists, two pedestrians, and a van driver, all looking at right me going the wrong way down a one-way street that was also reserved for cyclists. Thankfully they weren't shouting, but they were laughing. Just tried to avoid eye contact and waited for the ground to swallow me up. I got off the road and parked up nearby and went back to check the junction.
Yep. No left turns signs everywhere, at least three of them. I'd just missed them in a panic while I was trying to get out of everyone else's way. There were little cameras on every set of traffic lights, so now waiting for a letter in the post asking for £100 and dreading getting points on my license. Days after taking my P-plates off as well. An honest mistake but fuck me I just wanted to go home after that.