People feared closed borders could disrupt the supply line of toilet rolls -- despite the government's reassurances that it wouldn't -- and rushed to stock up. Supermarkets sold out, with some people bulk-buying enough to last them weeks.
And it's not just toilet rolls -- people have also been snatching up face masks, hand sanitizer, cleaning supplies, and food staples like rice.
There are plenty of reasons to refrain from jumping on the panic buying bandwagon; it takes away critical supplies for frontliners and health care workers, and spreads hysteria. And often, the supply chains are fine -- CNN spoke with two major Hong Kong supermarkets, two shipping companies, and two container operators, all of which said there was no shortage or disruption of supplies.