I love those 5 gallon bucket. My kids work at a bakery and I can get them fairly easily.
Here are a few uses. I'm sure folks will have others but these are mine.
Upside down tomato planter,mop bucket,stool, emergency toilet. (don't forget the lye), store food (different bucket!!!!) Shovel (both the lid and the bucket) rain barrel,washing machine, diaper bucket, pole foundation (mix the concrete right in the bucket and tap in your pole as it sets up, I did this once to put up a basketball hoop, it will still be there long after I am gone), string enough of them together and they make a fine raft, fill them with sand and they will stop a .308. fill them with telephone books and the will do the same.
Anyone else?