Seizure Identification:

Some symptoms are easily mistaken for seizures.
Conversely, you may not notice some kinds of seizures.

Consider this limited list:

Staring or unresponsiveness
Distorted perceptions - sight, sound, smell, taste, even touch
Involuntary arm or leg movements
"Fainting"
Hallucinations
Inexplicable feeling of fear
Automatic, repetitive behaviors