Coinstar
Coinstar
[A mischievous Cueball empties a small bag into a machine.] whirrrrrrr bzzt [Machine makes progressively less happy noises.] kachunk tshhhhhhhhhh clickclickclickclick GRIND [Machine malfunctions and shuts down.] pop beeeeeeeeeeeep! [Text below frame] Holiday tip: Coinstar does not handle chocolate coins well.

This is another one of Randall's Tips , this time a Holiday Tip.
Chocolate coins are a popular holiday candy, and thus this is another Christmas comic . These candies are usually plain chocolate formed in the shape of coins and covered in metallic foil wrappers.
Coinstar machines accept all your loose coins, sort them, count them, and then give you the same amount of money in paper currency, around 9% less as it says in the title text. You may find similar machines in grocery stores and shopping malls around the US and Canada.
These machines work by vibrating a box with a series of slots along one side, which each corresponding to the sizes of standard accepted coins. The vibrations move the coins along the different slots. If they pass through the slots the coins are then fed into a mechanism with a counterweight that's balanced to test the weight to ensure that it has captured the appropriate coin. Coins of the right size but wrong weight (such as similarly sized coins of different currencies) are dropped back out into a reject chute to be retrieved by the customer. Coins that do not fit the standard sizes also get rejected in the same way. There are also various anti-theft mechanisms that prevent coins from being counted and then retrieved. Coins that meet the programmed criteria are funneled into internal repositories and are counted towards the total.
The chocolate coins in the comic appear to have damaged the machine. As the only property that the candies share with actual currency may be its appearance the machine would not be designed to handle the softer material causing the machine to malfunction and create the unusual noises presented. The chocolate may have fouled the initial vibrating tabulator; it may be that the coins are getting caught in the reject chute or are fouling the scales. In any case, the anti-theft system is being triggered, causing the machine to shut down (preventing false totals from registering) and an alarm to sound.
The title text suggests that the machine would take its customary 9% from the total of the chocolate coins which is ironic since the reader knows that their candy has insignificant monetary value.
[A mischievous Cueball empties a small bag into a machine.] whirrrrrrr bzzt [Machine makes progressively less happy noises.] kachunk tshhhhhhhhhh clickclickclickclick GRIND [Machine malfunctions and shuts down.] pop beeeeeeeeeeeep! [Text below frame] Holiday tip: Coinstar does not handle chocolate coins well.
