YouTube is stuffed with sharing options and features, and you can, if you wish, link to a particular part of a certain video. Click "Share" on the video page, then tick the "Start at" box and enter a timestamp. If you don't want to enter a timestamp manually you can click anywhere on the video's progress bar.
The "Share this video" code is automatically updated with the new information and can be copied and pasted wherever you like, so there's no need for your viewers to sit through the whole of Manchester United's latest game if you only want to showcase one particular goal.