"well, see. it was like this: last night night, i opened one of the cupboards in my kitchen, and apparently i did a bad job of loading it last time it was open, because this damned frying pan jumped out and attacked me."
If you have a child, you can say he/she did it. I've seen it happen where an infant throws his or her head back and someone gets hit in the hose buy it and comes out with a shiner... it's possible. lol
a woman i work with came to work the other day with a swollen black eye, and a split lip, claiming she fell out of bed. nobody believed her. so make sure your story isn't something like "i fell down some stairs"