Talking about fines, wearing a hat on matchdays and failing to show for post-match interviews are also grounds for a hit to the wallet, according to the club's lengthy and often curious list of punishments for players.
Harriers' list details the fluctuating financial penalties for close to 30 different indiscretions.
In addition to the £10 for taking a pee in the shower or the £20 hit for not buying cakes, by far the biggest single penalty is a £150 fine incurred by any player who fails to turn up for training.
Answering a mobile phone in the changing room on a matchday, meanwhile, incurs a £50 fine for the perpetrator, as does going into the club offices or talking about wages, while wearing a hat on matchdays and failing to show for an interview cost £20 each.
The smallest single financial penalty, of £5, is charged to players who fail to wear flip-flops – or wear someone else's – park in the wrong car park or urinate on the training pitches.
Players can halve their losses if they pay up within a day, though fines are doubled if not paid by the the first day of the following month.
"The fines list has been played down by Harriers chief executive Colin Gordon, who insists it is a standard feature in most football clubs.
Mr Gordon said: "If you went into any club in the country, you would find a similar list. It is not a big deal.
"Any money collected goes into a pot for the players, which is then spent on an end-of-season trip or night out."
Harriers are a full-time club, with players earning wages understood to be between £150 and £700 a week.
They are currently bottom-but-one of the National League Premier table, 10 points adrift of safety, having endured a torrid 12-months in which they have diced with financial disaster and been forced to repeatedly slash the playing budget.
Mr Gordon, who had spells with Swindon Town, Birmingham City and Harriers as a player during the 1980s and 1990s, added: "We want our lads to enjoy playing the game.
"For a lot of players in the professional game it is just a job – I know, I have been there.
"We want things to be different."