If the car has just been started then stopped over and over without being driven, I'd say plugs will be fouled. When that happens there is virtually no spark then when you try to start, it floods very easily. Remove the plugs, with a fine wire brush give them a good clean the try again. Make sure they are not wet with fuel; it helps to get the plug ends hot over a gas burner so when more fuel lands on the plugs, it quickly evaporates off.