The short stories of Israeli author Etgar Keret are delicious little cartoonish seizures that take over your whole brain for 10 minutes at a time and then leave you feeling blissfully exhausted. They always start and end in unexpected places. His new collection, Suddenly, a Knock on the Door, is a good-hearted parade of problematic children, talking fish, occasional violence, some love, and quantum physics. It’s also packed with great, intriguing sentences like this one, which kicks off the story “One Step Beyond”: “Killers for hire, they’re like wildflowers.” Tell me more, Mr. Keret. (Town Hall, 1119 Eighth Ave,, 7:30 pm, $15)