unexpected; contrary to expectations; by chance; casual
casual income; extraordinary revenue; incidental income; nonrecurring income; perquisite
temporary; provisional; interim; special; extraordinary; extra
prize money; monetary award; reward
private; personal life; (one's) privacy
activity (of a person, organization, animal, volcano, etc.); action; movie (esp. during the silent movie period)
income; receipts; revenue
enough; sufficient; plenty; sufficiently; fully; thoroughly
which reminds me ...; come to think of it ...; now that you mention it ...; on that subject ...; so, if you say ...
congratulation; congratulations; celebration; congratulatory gift; present
consultation; discussion; discussing; asking (somebody) for advice