This effect is known as the inappropriate affect. It looks similar to schizophrenia.
A disorder in and of itself, inappropriate affect can be a sign of many underlying psychological or medical issues.
Since more than a century ago, psychiatric practitioners and other experts have recognized inappropriate affect as a problem among patients, noting events like tears or laughter that have no apparent basis.
When researching what is now known as schizophrenia in 1909, Stransky used the term "intrapsychic ataxia" to describe a condition where thoughts and affect are disturbed.
In 1950, Bleuler observed that individuals with schizophrenia who displayed improper affect had a substantially worse clinical prognosis than those who did not.
The treatment of persistent mental illness or brain damage are potential causes of inappropriate affect.
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