It is well known amongst the mechanically inclined as a skill and is much more than luck....although it adds to one's cool.
To Bench Knock: To use the skill of Bench Knocking.
To hit something with ones hand or foot and then it operates when before it was unfunctioning is bench knocking.
"I bench knocked that soda machine and it game me my soda that I paid for!", said the exhausted and frustrated teen.