For proof positive, just ask Clydebank's supporters who looked on in disbelief as Darren Henderson's young side twice came from a goal behind to clinch a 3-2 victory and put the Emirates Junior Cup hopes of the fancied Bankies to the sword.
This keenly-awaited second-round tie kicking off in brilliant sunshine belied a bumpy and quagmire-like Loch Park playing surface that did not lend itself to passages of cohesive passing football, and it was obvious from early on that the home side's "route-one" approach in shelling balls towards bustling striker Gareth Armstrong was going to prove effective.
Yet, it was the visiting Bankies whose noses were in front with just five minutes on the clock after a wicked bounce off a divot had the ball rebound off Glens goalkeeper Ally Semple's shoulder and lead to a melee in which Andy Paterson fed Joe Andrew, and he cut in from the right to fire a low shot into the far corner of the net.
Glenafton's response was instantaneous and fortunate as, one minute later, Paul McKenzie mishit a right-wing cross that visiting goalkeeper Robert Hamilton fumbled into his own net for 1-1.
Semple's long kick-outs, abetted by Armstrong's ability to win more than his fair share of aerial challenges, was causing a few anxious moments in the visiting defence, however relief of sorts came at the other end when Paterson and Andrew combined to great effect again.
A clipped pass forward by the full-back was exquisitely controlled by Andrew, who duly rounded Semple before firing into the empty net for 2-1.
Team boss Henderson's throwing caution to the wind by introducing attack-minded substitutes Craig Menzies and J.P. Boyle at half-time, paid dividends on the hour mark when Bankies midfielder Ryan Kelly's attempted clearance in a crowded penalty box struck the foot of Craig Potter and rebounded beyond Hamilton.
Glenafton, playing with the greater effort and purpose, were dominant over the closing stages and, one minute from time, Lady Luck again smiled on them as Paul McKenzie fired a shot goalwards that appeared to be covered by Hamilton until a wicked deflection off Ian Gold's leg sent the ball high into the net for a 3-2 triumph.
Bankies boss Budgie McGhie's of his team's performance was blunt and to the point.
He said: "Our defending was poor and naïve to say the least and, although Glens enjoyed an element of luck with their two second-half goals, we didn't help ourselves one little bit.
"To progress as a team we need to learn quickly that playing nice football is not enough and there are times like in Saturday's conditions when resilience and a rolling up of the sleeves is required to get results."
Glens full-back Craig McEwan said: "We've not enjoyed any breaks whatsoever this season and it helped no end to get our fair share at the weekend.
"That said, the gaffer went for it with his substitutions at half-time and I felt there was only one team that looked like winning the game in the second half.
"Big Bo Armstrong was magnificent, but everyone put in a great shift and we now need to continue doing the same every week to get this club moving in the right direction."
It only rubbed salt in Clydebank's wounds when news filtered through that they were the only one of the West Region's elite to take an Emirates tumble.
All the other participating top-flight clubs secured their passage into the third round, led by cup holders Shotts Bon Accord, for whom new signing Kenny Wright came off the substitutes' bench to score a brace of second-half goals in a 4-0 defeat of nine-man Haddington Athletic – Colin Williamson and Adam Coakley were the other Shotts marksmen.