Wrong one...
Last night I went to the wrong car and kept trying to put my key in the door but it wouldn't work but I kept trying because...
I'm a determined individual!
The real car owner walked over and said,
"I think your key isn't working because that's not your car. That's my car...".
That was when I realized why my key wasn't working.
The only thing I could think to say to the person who enlightened me about this was,
"I'm not drunk."