A man pulled a 12in kitchen knife in front of terrified passengers after being stopped from boarding a bus in Eastbourne.
The driver refused to let the man board outside Leaf Hall when he could not cover the 40p journey cost.
The man, in his late 20s, pulled out a knife and started swearing at the driver.
He eventually left the bus and headed towards Langney Road as the driver called his depot and the police.
Officers have appealed for witnesses to call them on 0845 6070999 or Crimestoppers in confidence on 0800 555111.
The offender, who appeared drunk, had short hair, was unshaven and wore a grey T-shirt, dark jogging bottoms and light-coloured boots.
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