To illustrate my point, the anecdote's appearing in this book include the story of a lecturer who began a problem with the words "supose there are n childeren in a room" at which point he was promptly intereupted by a student asking, "What if there aren't n childeren in the room?"
This collection, first published in 1953, contains some wonderful insights into the development and lifestyle of a great mathematician as well as numerouse anecdotes, mathematical (Lion and man is excellent) and not-so-matematical. The latest edition contains several worthwhile additions, including a splendid lecture entitled 'The Mathematician's Art of Work', (as well as variouse items of interest mainly ot those who believe that the great court of Trinity college, Cambridge is the centre of the universe).