oh my goodness, YES, and I'd nearly forgotten. It was so embarrassing. I was actually the non-invited guest's non-invited guest.
When I was in college, I briefly (very, very briefly) dated a guy who I will call Perfect Snowflake. His parents (Mr. & Mrs. Snowflake) thought that he was simply the most perfectest human to ever walk the earth. After we'd been d@ting for a few weeks, he invited me to a wedding the following weekend. Being young (I was around 19), it didn't occur to me to wonder how he'd have a +1 invitation for a wedding that was only a week away.
Wedding & reception are both at the grandparent's home of the bride, it's out in the country, about a 2 hour drive from Perfect's home, and a 3 hour drive from mine. So I drove to Perfect's home, and then his parents drove us all out to the wedding.
We get there, and there are *maybe* 20 people there. Many of them are glaring daggers at us. I'm confused, and kinda freaked out to have so many people looking at me like I'm some kind of social abomination. Turns out that Mrs. Snowflake is the aunt of the groom. The wedding was supposed to be for immediate family and closest friends only. The only family invited were parents, grandparents, aunt & uncles (and husbands/wives of aunts/uncles, but NOT the cousins). Bride & groom only had invited their 2-3 closest friends, outside of family. So having us there was a HUGE strain on the menu planned (it was a very fancy catered meal), as well as was deeply awkward, since we obviously stuck out.
I found this all out because MoB didn't realize that I was in the bathroom when she was freaking out about it to someone nearby. Turns out, Mrs. Snowflake is well-known for not understanding the concept that being invited to something doesn't mean that her son is automatically invited. It was deliberately said within Mrs. Snowflake's hearing that the wedding was VERY small, and that no cousins
were invited. MoB was complaining that she *knew* someone should have point-blank told Mrs. Snowflake that her son wasn't invited, but that bride had been worried about Mrs. Snowflake making a scene if they pointedly told her that her son wasn't invited, so they didn't.
I spent most of my time there skulking around the yard/in the car, as I had absolutely no idea what to do, and was totally mortified. Mrs & Mr Snowflake & my BF kept trying to convince me to join the festivities, and I kept saying that I didn't feel well & wanted to stay in the car, away from everybody, so I wouldn't get them sick.
In retrospect, now that I have more experience in the world, I don't know what I would have done, but I probably wouldn't have skulked around outside. Maybe put on my best face and tried to stay unobtrusively in the background? Although there really wasn't much in the way of "background" with such a small wedding, so...I dunno.
At least now I'd have a cell phone, so I could theoretically call someone to come get me.