During my years manufacturing and selling drill rods, I have had customers experience problems. Although these are not common, they are always of concern.
In order to work properly, every bit is designed to run with a given amount of down pressure. It takes a certain amount of push. When drilling vertically, this is bit weight.
If you are running conventional oilfield drill pipe, drilling deep with a mud rotary or perhaps drilling 5,000 feet for natural gas with flush joint drill pipe, then you are familiar with the term "upset."