Step 1:
Arrange for your chain to break during your morning commute. It is important to do this in the dead of winter when the temperature is about -22 Celsius. You can be assured of the best result if this happens when you are traversing a particularly dark section of wooded trail.
Step 2:
Fumble about in the dark with your chain tool while your hands rapidly go numb. Peering through fogging glasses is helpful as well. Drop parts in the snow if you can arrange to do so.
Step 3:
After you finally manage to reassemble your chain, pedal to work and continue about your day.
Step 4:
This next part is very important. DO NOT INSPECT THE CHAIN TO VERIFY THAT YOU REASSEMBLED IT CORRECTLY. Instead, continue commuting on the bicycle for the next two weeks.
Step 5:
When you start to experience horrendous chain slip is the time to inspect your bicycle. You will find that the teeth of your cassette or freewheel are badly worn out and you will have to obtain a replacement. You will now check the chain closely and discover that you lost a roller while assembling the chain in the freezing dark. This resulted in a link with an exposed pin that then did a very nice job of wrecking your drive train.
Step 6:
Swear.
Step 7:
The following Autumn when you are overhauling your bike for Winter service you will notice that one of the derailleur pulleys has been neatly transformed into a shuriken! Wasn’t that easy?