There is a certain class of people who are always looking to the future. They acquired excellent planning skills while growing up and are experts at thinking ahead.
They are known as the Just-In-Casers.
Just-In-Casers rarely like to commit to things. They much prefer to keep their options open. In fact, they hardly ever do much at all just in case something comes up later.
They don't like to buy things just in case they find them on sale somewhere else.
They don't like to wear their favorite pieces of clothing just in case they might want to wear them later in the week.
They don't like to fill their schedule just in case something comes up that they really want to do.
And, most of all, they don't like becoming fleishig just in case they want to eat ice cream later on.
This last one is very important. According to some stringent opinions, it is better to starve all afternoon and stay dairy for the possibility of ice cream at night than to eat meat and not be able to be open to the prospect of ice cream at all. Some are more lenient, however, and say that if you know you will still be awake six hours later, it is okay to eat meat. Just as long as you know you can still have ice cream sometime before you go to bed. If one waits only three hours, these restrictions need not apply and he/she can eat meat whenever he/she is hungry. Such are the rules of the Just-In-Casers.
If you are a Just-In-Caser, I'd suggest becoming lactose intolerant. Then you'll never have any of these ice cream issues. :)
For the rest of us, we must pray for decent parve ice cream.