I remember I did that for a while after someone nicked my bell a few years back. Only used very sparingly - but it did make the mobile phone zombies jump a bit. Ditched it again pretty quick, as I didn't really bother much and I realised it was a bit twattish. Didn't realise it had become a thing?
Bloke using a whistle instead of a bell to alert pedestrians on his commute. Great fun to watch.