Wat cause(s) tankslap?

[kito]

hey can dampers be fixed on all bikes?? or only big cc bikes??

[quikslvr]

i experienced it twice..1st was at jb.open my throttle while goin thru the speed limiting strips then the handle suddenly moved left n right alot of times by itself.i tot wtf is happening.as quickly as it appeared,it suddenly died down.2nd time at alexandra road.filter to AYE n hit a bump n for abt 3-5 secs experience tankslap.this is more scarier than the 1st coz i was cornering.both times luckily didnt accident.think god look after me..thank god.i read that if a tankslapper happen,do not fight it.let go of ur hands from the handle n it will naturally lose the energy.the more u try to grip the handle to stop the tankslap,the worst it gets..

[hitman]

scary experience. hopefully it's the 1st n the last.