oefenen bekijk deze situatie
https://www.bing.com/videos/search?q=boze+klant&&view=detail&mid=5AE0B70169996087D6B75AE0B70169996087D6B7&&FORM=VRDGAR&ru=%2Fvideos%2Fsearch%3Fq%3Dboze%2520klant%26qs%3Dn%26form%3DQBVR%26sp%3D-1%26pq%3Dboze%2520klant%26sc%3D3-10%26sk%3D%26cvid%3D2E2512833DA141508F519056B15581CE