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As a child my sister was terrified of escalators and I never understood why, until one of my friends almost lost a toe to some particularly sharp teeth on the edge of an escalator.
He was wearing flip flops at the time so the argument could be made that it was as much his fault as the escalator's, but seeing his toe after that incident made me switch to stairs for years to come.
Escalators are safe until they decide to drop out beneath your feet or gobble up your shoe, so ride that moving staircase with caution, folks- and keep all your toes where they belong!
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See Even If You're Just A Little Nervous About Escalators, You Won't Make It Through This Post here