How I got robbed in Nairobi

I lost my wallet today in a matatu (private bus) in Nairobi and I would like to alert others about the clever strategy of the thief. A young man sitting behind me asked me if I could see the coins he had just dropped. I felt the need to be helpful and picked up his coins from my seat. I guess they did not succeed in taking the wallet at first try because after a while he asked me if I could see some more. I believe the other man sitting next to me took my wallet when I was looking for the coins for the second time. He took my wallet from my bag which was in my lap. I guess the lesson is that one should not allow anyone to distract one's attention from one's own belongings. Luckily I was carrying very little money.