1. Watching a very good horror movie, alone, at pass midnight...

Totally not a good idea... Don't believe me?? Try watching the Siamese horror movie "Coming Soon" or "4bia" alone in ur room at night... See how long u'll last before dashing out of the room and turning on all the lights in house... the movie "4bia" has four parts... the last part is the scariest...

2. Forgetting to pee or eating food that can possibly cause diarrhea before a very long journey... 

Not a good idea... Just imagine this - u're having diarrhea, u're miles away from ur destination and there is no sign of a toilet near by... U'll feel extremely cold... Cold sweat will tricker down ur forehead... U'll have goosebumps... U'll keep on farting... Then, when u finally found a toilet, the closer u get to the toilet bowl, the more pain u feel... 

What else??