don't cross the line

I hope that I have proven to those who know me that I am a stand up guy. A few examples:

• At the grocery store, if you only have a few items, you can go in front of me.
• I will hold the door for you, no matter who you are.
• I will help you install a fence after I have already worked 14 hours that day.

There's just a line I draw:

Do NOT under any circumstances, in the middle of dinner, ask for some of my single can of soda. You see, it's a science of rationing and pacing. At the beginning of eating, I mentally allocate all of the fluid and associate it with a corresponding food to fluid ratio. I try not to go through 2 cans of soda in a meal and one is just barely enough to pass muster.