Japanese people are still very much fervent believers in coins evident by their ridiculous number of vending machines.

A slight drawback might be how coins from other currencies might slip through while being handed over during a transaction.

Enter Comiket.

Short for Comic Market, it's one of Japan's biggest doujinshi events, where self-published and fan-made works pertaining but not limited to anime, manga and games are sold.

The problem of foreign coins being mistaken for Japanese yen was apparently so widespread that there was a massively retweeted post, and an article, warning the people of Japan to be careful.

"Everyone in the Comiket circle! Please be careful of this coin, it looks just like a 500 yen coin! [The 500 Korean Won coin] is only worth 43 yen! As you'll immediately spot the difference when you see the crane on the back (or the front?) the coin, flip the coin to check even if you're busy!"

コミケの全サークルさん！こいつに気をつけて！！😡500円玉に見た目そっくり！43円にしかならないよ！！😡
裏側（表？）が鳥で違いが一瞬でわかるから忙しくても裏返そ！😡#拡散しておねがい pic.twitter.com/79YnwK8UXT

— 絵守未來🍁 (@miku_emori) August 11, 2019

One Japanese Twitter user chimed in with his own experience of a coin gone wrong.

Here is his tweet.

コミケ時期にtwitterに良く出てくる「100円玉500円玉に良く似た外国通貨にご用心」の話題。
確かにその事件は1回は存在したんだろうが、パクツイで件数が拡張しているだけだろ？

…そう思っていた時期がわたしにもありました(;´д｀) pic.twitter.com/u89vMegmpT

— masa＠お疲れ気味 (@masa155) August 12, 2019

Here is a rough translation of the tweet.

I've been seeing lots of tweets warning others to be careful of foreign currency that resembles 100 yen and 500 yen coins. I do think that [the confusion] would happen at least once, but I thought it was just one of those messages that was spread from being copied and forwarded.

That was what I thought until I also found myself in the same situation...

Here's what the user got:

So not fake by any means, but definitely not a 100 yen coin.

Oh no, a Singapore coin.

100 Yen roughly equals around 1.30, so it is definitely a net loss for the twitter user even if he had figured out the actual currency he was holding.

And this might be kind of a problem considering the ridiculous popularity of Japan as a destination for Singaporeans.

So even if you're not headed to Comiket, do take note when you're using coins in Japan.

Top image via Masa155 on Twitter