Hands down - was a camping trip with some friends (Spring Break in college). We drove to Orlando, FL and were planning to to Disney World, then hit Daytona Beach on the way back. We decided to save money by camping, so we rented a popup camper.
The trip started off with an omen...we watched an Animaniacs cartoon ep where the gang was going on an adventure, and their motto was "It's not just a mistake, it's an adventure!"
Well, we made it safely to FL, but once there, it took us 4 hours to find our campground that was only supposed to be 15 minutes from the gas station we stopped at...
Then once in, we got directions to our camp site. Take the first left and find the site - not too difficult. Only problem was the first left turned out to be a very wide footpath (not marked at all), not the road to the campsites. After driving down it for about a mile, we realized this was not the road and it started narrowing, until we got stopped by a chain fence.
We were in a van, pulling a camper, on sandy soil. No way to turn around. So we ended up unhitching the camper, pushing it back to a small clearing by the corner of a bend, then managed to get the van turned around. Then we realized that leaving the camper sitting on sand was not a smart thing to do when we had to try to hitch it back up to the van...as it had sunk into the sand a bit. How we managed to get it lifted back on, I'll never know.
We finally made it out and found the right road to the campsite - and got setup. 8 hours from our "short trip" from the gas station to the camp site.
That's when we dubbed our revised Anamaniac's motto for our trip..."It's not just an adventure, it was a mistake!"
After that, we had other "issues" with a couple people in our group that turned out to be very whiny and complained the rest of the week, but I don't want to get into that novel.
Let's just say, I'll never forget that trip.