In all seriousness... The sympathetic nervous system shuts off digestion. Digestion using up too much energy that can get shunted to your muscles to run your ass away from the saber toothed kitty, lift a car off a loved one, or whatever. In extreme cases it flushes the entire system. Which is why you can shit yourself when really scared. And why people using stimulants, their first trip is to the bathroom, and then they don't eat for days. Similarly, the whole peeing by yourself thing gets taken away (at least partly) and becomes an autonomic response instead of a conscious response.
Increased adrenaline equals peeing more frequently and shitting less.
Have an anniversary those last few weeks in Aug?