Good grief whenever the topic of sports records and which ones are the least likely to ever be broken. There is one record that is never mentioned, and it's a guarantee that this one will never be broken.

Set back in 1983 it's the NFL record for the longest run from scrimmage, 99 yards set by Tony Dorsett. It can be tied(which will probably never happen either) but it can never be broken, unless the NFL increases the size of the field.