Beans may be good for the heart, but empty tin cans are not so good for hands or fingers - so says the Advertising Standards Authority (ASA), which on Wednesday banned a Heinz TV ad for encouraging people to beat out a song using empty cans - but Heinz is not alone.The Heinz TV ad, using the catchline "Learn the #CanSong", shows a group of people tapping and twirling empty cans to drum out rhythms.Three people complained that the TV advert encouraged unsafe behaviour, while six more said it could be dangerous if children tried to copy the music. Heinz denied the ad posed a safety risk, but the ASA upheld both complaints, saying it might result in "hands or fingers being inserted into an open tin". TV is the most complained-about advertising medium, with 11,611 complaints about 3,920 different commercials made to the watchdog in 2015.