Oh goodness! I'm so glad I've found this thread! It's had me cry laughing.
I have a couple to add... My life is just one endless stupid moment after another
- As I'm called Milly, in my friends group these moments have now been named ''Millyisms'' Haha!
I'll start off with one which was my DP.
I walked into the kitchen one day to see him shoving some sliced meat from the fridge into his mouth. I noticed the packet he was holding was 'Turkey Bacon' & proceeded to tell him it needed to be cooked before it was consumed. Que a fast run to the bathroom 
Like TapDancingPimp I too have stapled my own finger - just to see if it would go through or not. It does. It hurts.
Meeting my step fathers mother for the second time, I took her to the local supermarket to pick up a couple bits of shopping. Yelling after he down the aisle ''Was it Durex you wanted??'' ... Instead of Andrex. I was mortified. Turns out she has a wicked sense of humour!
A couple years ago after moving into a new flat I was cleaning the bathroom & put some bleach down the toilet. Decided I didn't like the smell & poured another kind of bleach over the top. (I know, idiot). Half an hour later I lifted the toilet lid & no word of a lie, all this ''smoke'' whooshed out the toilet. Tears rolling down my face, coughing my lungs up, I flushed the toilet. Three hours later I was sat in A&E after unknowingly gassing myself!!
And lastly (for now), this Christmas just gone I was so organised. Writing my Christmas cards in a bit of a hurry to get them posted abroad. Sent them off. Got a message a few days later from a friend in Belgium thanking me for her card but saying she had to bin it.... I'd only gone & wrote her ex's name inside - from THREE years ago. Would of been funny but she's now engaged to another bloke who she's due to marry this year 