My mum lives in France and DH and I went for Xmas one year. Flights were expensive so we thought we'd drive. Big mistake.
My mum has been known to arrange for me to do things for herself and other people without asking me. She pulled out all the stops for us driving. It was a 16 hour journey, and we had presents and a small suitcase. Our stuff filled the boot of our modest car. I was gonna take a pillow and duvet so that whoever wasn't driving could lie in the back (this was pre-children).
The day before we were set to travel, my grandparents popped round with loads of shopping bags full of random stuff like Daz, digestives, fairy liquid etc. Turns out mum had done an Asda online shop, sent it to my grandparents and asked them to stick it in our car (she doesn't like French brands
).
That same day a delivery turned up at our door of a huge parcel force box. I recognised the sender as being a daughter of my mum's friends. I rang mum and she had said to her friends' daughter that it would be fine for her to send presents for her mum and dad to my house, and I'd bring them to France.
Not only was the back seat covered in mum's crap (so no catching a comfy nap), there was so much extra stuff I had to push my seat forward in the passenger seat so my knees touched the dashboard. For 16 bastarding hours.
When we arrived, tired and bored from the drive, mum and stepdad didn't so much as say hello. They opened the boot, and rummaged through the bags to make sure they got everything they ordered 
On the way back, we thought "atleast we won't have to take loads of shit with us". Oh how wrong we were!!
Morning of setting off, mum announced that she wanted us to take a few bits back for my grandparents. This included about 5 boxes of stuff like dinner sets (of which they already have about a million) and a fucking privacy partition. We had a Kia fucking Picanto! After much to-ing and fro-ing they managed to get it in but it meant it came across the passenger headrest and i had to spend the 16 hour journey back with my head pushed against the window of the door
Mum also gave me an address about 2 minutes before setting off, she wanted me to deliver the yellow box to her friend in Congleton, who was "on the way back to ours". This arsing about meant we nearly missed our ferry, we literally had 30 seconds to spare!
After getting back to UK and popping the Congleton address I the sat Nav, it was a 30 mile detour each way. We didn't go, I phoned mum and said that if her friend wants the box she either comes to get it or pays for postage and I'll send it when I have time. mum was most put out that I didn't do this "small errand" and was mortified that I'd showed myself not to be the lovely girl she tells people I am 
We've never driven since, and never will again. I'd never let her take the piss like that again either