stay away from the "Jersey Shore" type douchbags...
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I hope one day I can answer a question that way.
If you aren't sure of the cause, you can try to preempt them by drinking lots of water and taking ibuprofin and mega vitamin B complex before you go to bed. Many times headaches are simple dehydration. Ibuprofin helps with the headaches and vitamin B helps your liver break down the alcohol. This is basically my NHC Survival Guide.