Let's see... 2nd trip out, trying to dewinterize for the first time (we left it winterize for maiden trip), we enlisted the help of a neighbor. When we were filling the hot water heater we wanted to make sure there was water in it. We didn't know how to accomplish this so DH and I had a brilliant idea....loosen the drain cap just a little to see if water drips out. Bad idea. (We did this before the neighbor could stop us). The drain cap shot off like a missile across the campsite, water flew out sending chairs flying and soaking DH. The city water was still on. The neighbor flew around to the other side to shut it off. The neighbors wife was laughing hysterically and it was all we could do to convince her that was not his idea to try.
On our first week long trip, we went to myrtle beach in June 2011. We had managed to hook the battery up backwards and didn't know it. We drove all the way there without knowing this and wondering why our fridge wasn't working. The lights were not working right and outlets and AC were out as well when plugged in to shore power. After several panicked posts to rv.net forums we were diagnosed and on our way to hunt for some fuses. Turns out that AutoZone carries some fuses we needed when camping world was out. After spending a whole day dealing with this we learned to mark our wires and carry extra fuses of all types that we need.
That same myrtle beach trip, a cabinet popped open and our liquor fell from the top shelf to the floor. A bottle of whiskey and a bottle of sour mix broke and spilled all over the floor. Man was that a sticky mess.
On another trip DD (3 1/2 yrs old @ the time) locked everyone out of the bathroom so DH had to disassemble the doorknob to get in. (This was 9 pm and we had just finished setting up camp after a long day at work).
One night I decided to switch from drop in packs for my black tank to the geo system. I read the packs, no mention of formaldehyde. With the geo method, you can use bleach from time to time so I thought I would start fresh with it. Turns out I was playing amateur chemist. I got a mist like gas rising from the black tank. It was after dark in a storage lot with no dump station or water and 30 min from home. Local state park had a dump site but in nc they close and lock the gates at dusk. I flew home, filled every bucket i could find with water, loaded it up in the back of my armada and flew back to the storage lot. Dumped all of it in the tank and then emptied the tank the next day. I got lucky, no damage.
The final one was bringing my mom along. My mom was being nice and making pancakes for us. She shook the bottle (shake and pour bottle) to the point it exploded. We had pancake batter everywhere... the ceiling, floor, carpet, sofa, vignette, cabinets, stove etc and she was covered. Man was DH peeved. I spent the next day at home with handheld carpet cleaner getting that stuff off of everything. My poor mom felt so bad. It was funny later.
Most of these issues occurred in our first year of camping. We have grown wiser with each one. I thank my little trailer everyday for surviving our blunders. You will learn to laugh at yourself and eventually you can laugh with the other newbies at their mistakes.