As a baby my daughter had a toy with a large sucker on it that we would stick to the high chair table to keep her occupied while waiting to be plied with food.
Once I stuck the toy to my forehead to show her what a fun guy Dad is.
Then I had to spend the next week with a red 3 inch circular mark on my forehead.
Did the same suction-cup thing when my daughter was an infant! It was actually a bit scary when I tried to pull off the toy and it wouldn’t budge.
Also once did a do-rag sunburn thing. My face was beet red, forehead white as a sheet. Straight line of demarcation.
Once, in a galaxy far, far away, when I was a much, much younger and wilder man, I had spent the evening with a young lady friend, both of us under the influence of an illicit substance that need not be mentioned here. Without any sleep and still under the effects of the unnamed substance, I went to my job, a professional office in which I wore a suit and tie, jacket usually abandoned to the back of my cubicle chair.
One of my first tasks for that day was to make multiple copies of some document for wide circulation within and without the organization. Under the mesmerizing glow of the copy machine I developed an obsession that my shirt was not properly tucked in the back of my suit pants. So, for the entire twenty minutes I spent copying the doc, my right hand was continually tucking my shirt “back into” the rear of my suit pants.
When I finally took a bathroom break, a quick glance in the mirror revealed that I had completely twisted my dress shirt, including necktie, in a clock-wise direction to the extent that my collar, necktie and shirt buttons were now situated over my right shoulder.
I should have heeded the advice of Nancy Reagan…
I used to wear slips. Until one day the elastic in my half-slip decided to abruptly and permanently retire just as I walked into the cafeteria at work.
I wear pants most of the time these days. Sometimes they’re on backward, but no biggie. 
I’m semi famous among my friends and family for wearing a pair of my groom’s sweat socks during my wedding. I’d been wearing them while I was getting ready to protect the delicate hose I was wearing. I put on the Big Dress and the headpiece thingy, then slipped on my beautiful matching shoes but failed to notice the sweat socks until after the ceremony. Ah well, I just took 'em off right there, threw them to the crowd of guests like a bouquet toss, and grabbed a glass of champagne.
A few years ago I was taking a Spanish course, and my seat was right next to this guy that I was trying to impress. I had lost a lot of weight just before the course started and was feeling pretty confident, so one day, I went to class wearing a tanktop and these teeny-tiny shorts. At one point, I crossed my legs (as I was used to just wearing jeans) and a woman who I was sort of friends with passed me a note that said “Your panties are showing”. I made sure the shorts were covering as much as possible after that point.
I’ll just repost this from a couple of years ago here
Hangover. 
I was delivering pizzas while in college and brought a huge order to a youth group at a local church. As I was walking past about 40 kids toward the front of the hall, one kid said to everyone “that’s the guy who was driving around picking his nose!” I was mortified but looked confidently at him and said “yep, that was probably me!”
But did it impress him?
I walked into work once and didn’t realize until I took off my jacket that I was still wearing my pajama top.
He stared at my cleavage for most of the class that day, so at least that aspect worked.
Arriving at the office with my toofbrush stuck into my breast pocket?
I don’t remember how I ended up with it, but I had a circle of layered duct tape maybe 6" in diameter. I stealthily placed it on the head of the shipping clerk and went on about my business, thinking he’d notice it after a bit.
Hours later I see him, still sporting his duct tape beanie, so I ask him what’s on his head. He instantly suspects that I was the one who put it there, and I confess that I put it on there that morning. Then he tells me that he’d gone to the bank at lunch, not the drive up but the walk in bank. With a duct tape beanie on his head.
I thought that was a lot funnier than he did.
Wow, I just had a close one…
I got to work this morning and went straight to my office and closed the door. Just went to the restroom (didn’t run in to anybody on the way) and while I was washing my hands and looking in the mirror, noticed a dime-sized, thick, chunky booger crust on my cheek.
I am sooooo gross.
Is that a leg?
I’ve had this happen too. Not just a small spot either, but soaked from nipple to waist on one side. Good thing it dries fairly quickly.
Not sure as it counts as a personal laxity but it was embarrassing beyond all belief. When I was about 19, still living at home, my dad came into my room to talk to me about something. I was sitting at my computer desk, back to it as we spoke. When he left, I turned around and there…standing straight up at attention on the desk, was my tiger striped vibrator. There’s no way he hadn’t seen it and I thought I was going to die. I avoided him as much as possible the next few days.
My wife was leaving for lunch with coworkers from her job that she had started just that day. She twisted her ankle stepping off a curb and by reflex yelled “Fuck!” The worst part, though, was the loud fart she emitted at the same time.
She’s a delicate flower, my wife.
I once wore one brown shoe and one black one.
Did not notice until I was on the way home from work, looking down at my shoes while pumping gas.
Never get dressed in the dark.
Per the OP, I’ll wager neither of these personal laxities went unnoticed by your wife (or probably by anyone else within twenty yards).
Maybe it’s just recency bias, but I’d say your post and the one before it (by AngelSoft, re: her dad spotting her prominently displayed vibrator) were among the most amusing so far in this thread.