Ok, we've now got enough keywords in these two posts for me to fess up to mine........
I left a gas grill on........
FOR FOUR DAYS!!!!!!!!
But, how is that even possible you ask, wouldn't the propane bottle have run out long before that?????
Well yeah, it would have, except.....
The first house I bought had the gas grill on the back deck tied into the house's natural gas supply. On one Friday night I cooked two awesome steaks for the Mrs. and I and left the grill on to burn off the racks. Well, one thing led to another (Hey, I WAS young back then

) and I completely forgot about the grill! It was the following Tuesday that I happened to walk past it and felt an odd blast of heat blow by me in the breeze. I thought, "That's odd, could the bright sunshine have heated it that much ,so that I was feeling the warmth as I walked past? And then it hit me..... The steaks on Friday, , , the burning off the racks, , , , the

, , , , oh ****!!!! it's been on since Friday?!?!?!?? Four DAYS?!?!?!? This thing's gotta be destroyed! I lifted the lid fully expecting the burner tubes to have turned to metal dust after running full blast for four days but no, lo and behold it had withstood my forgetfulness, remember this was 35 ish years ago and Webber still built a quality product back then. And yes, you can BET I checked twice each time I used it thereafter to make really really REALLY sure I had shut it off
Believe it or not I think I recall that it only added around $30 to that month's gas bill, but then gas was a whole lot cheaper back then.....