Yes, laughter can be connected with seizures — but there are two different situations that are easy to confuse.
Gelastic seizures: laughter is the seizure symptom
In a gelastic seizure, the laughter or giggling is part of the seizure itself. It is often sudden, stereotyped and may not match how the person actually feels. The ILAE describes focal emotional seizures with laughter as characteristic of hypothalamic hamartoma, although they can also arise from frontal or temporal regions.
In hypothalamic hamartoma, gelastic seizures are often brief and frequent and can be subtle enough to go unrecognised, especially in children.
Laughter-induced seizures: laughter is the trigger
This is different. Rare case reports describe laughter-induced reflex seizures, where genuine laughter precipitates seizure activity. Published literature suggests this is extremely uncommon, so repeated seizures after laughing deserve specialist assessment rather than assuming laughter is a common epilepsy trigger.
Why the distinction matters
“The person laughed during the seizure” and “laughing caused the seizure” are not the same observation. Timing matters: did laughter begin spontaneously as the first unusual event, or did normal laughter reliably come first and then trigger the seizure?
Sources
ILAE EpilepsyDiagnosis.org — Focal emotional seizures
ILAE EpilepsyDiagnosis.org — Hypothalamic hamartoma seizures