Passengers on a bus in Qingdao, east China, were stunned when a man ripped off the shoe of a pensioner on-board and started licking it right in front of them.

After watching the bizarre scenario unfold in shock, the pensioner managed to snatch back his shoe and move to a different part of the bus, reported People's Daily Online.

The extraordinary situation was captured by the bus's surveillance earlier this week.

Just a normal day: The man (top right) appeared completely normal before the incident in Qingdao, China

Approach: Out of the blue, the unidentified man grabbed the leg of the pension, who was sat down (pictured)

According to reports, the incident took place on the morning of November 3.

On-board CCTV captured footage of the unidentified man, thought to be in his 20s, as he got on the bus.

Initially he seemed normal and took a seat near the middle of the bus.

A few seconds later in the footage, he appeared to be getting ready to get off the bus.

However, after a few seconds standing at the rear door of the bus, he walked to an old man sitting in the middle of the bus and grabbed his left leg.

He then proceeded to raise the leg with both hands and peel off the pensioner's shoe.

Even more incredibly, he put the shoe up to his nose and appeared to be sniffing it before rabidly licking the sole.

Attack: The man sniffed and licked the sole of the shoe for several seconds in front of stunned passengers

Determined: The pensioner tried to stop the man from lick his shoe (above) but the man batted his hand away

Retrieved: The pensioner eventually got his shoe back (above) and the man moved to the rear exit of the bus

The other passengers on the bus stared at the man while he licked the shoe for several seconds.

He even batted the pensioner's arm away when he tried to reach for his shoe.

The pensioner was visibly stunned but managed to get his wits, and his shoe, back on a second attempt.

After the pension retrieved his footwear, he moved to the front of the bus while the man moved back to the rear exit.

He appeared to be perfectly normal again as he got off the bus as if though nothing out of the ordinary happened.