I went through a relatively short phone interview, followed up several days later by a series of one-on-one interviews with three different people at the company. These were pretty much industry-standard questions.

The phone interview included the usual get-to-know-you and behavioral-type questions. The one-on-one interviews were followed up by technical and riddle-type questions.

You are given 2 eggs. You have access to a 100-storey building. Eggs can be very hard or very fragile; they may break if dropped from the first floor, or may not even break if dropped from the 100th floor. Both eggs are identical. You need to figure out the highest floor of a 100-storey building an egg can be dropped from without breaking. Now the question is: how many drops do you need to make? You are allowed to break 2 eggs in the process.