OMG Why didn't I know this before.

The video likely worked due to its unexpected and unconventional approach to a common task (preparing a sandwich), creating a 'life hack' or 'tip' that viewers might not have considered before, sparking curiosity and engagement.

The video shows a person preparing a sandwich by first cutting a slice of cheese with scissors, then washing it under the tap, and finally adding ketchup and mustard to the bread before assembling the sandwich. The creator expresses surprise at not knowing this method before.