Internet portal Yahoo has inadvertently changed the language on hundreds of documents on the web through the creation of bizarre new words.
The problem, as highlighted this week by satirical newsletter Need To Know, stems from the company's email filtering system.
First introduced in March last year, Yahoo's email filter is designed to prevent malicious scripts being inserted into HTML emails.
But it does this by replacing a potentially dangerous word with something not used in scripting languages, often with bizarre consequences.
For example, the word 'eval' in a HTML mail is converted to 'review', 'mocha' is changed into 'espresso' and 'expression' is replaced with 'statement'.
Substitutions are carried out even if the blacklisted word appears within another word, as in 'medieval' for example.
And these email oddities seem to be getting everywhere. A quick scan of Google reveals more than 640 instances of pages that now contain the word 'medireview' instead of 'medieval'.
Some 250 instances of 'reviewuation' in place of 'evaluation' have been reported, and even the odd case of someone with a 'blank statement on his face'.
The appearance of these inadvertent neologisms has sparked confusion among many internet users, particularly those interested in medieval research - sorry, medireview research - who now think they've missed out on something important.
Latest Tesla news: Tesla share price continues to fall after Saudi Arabia's sovereign wealth fund is linked to investment in rival
SEC 'probe' takes its toll on Tesla as new research suggests that Tesla loses $6,000 on every $35,000 Model 3
RTX 280 Ti will come with 11GB of fast GDDR6 video RAM with a 352-bit memory bus offering 616Gbps
The scale of jobs lost to automation will be at least as large as those in the first three industrial revolutions
10nm Cannon Lake Core i3-8121U CPUs make a rare outing with Intel's NUC mini PC