Nobody's perfect, and human error is almost inevitable.

But some monumental screw-ups can end up costing shedloads of cash.

Here are some of the most expensive mistakes in history,

which should make you feel slightly better about your own slip-ups.

You're listening. You're listening to be a minute. better about your own slip-ups. First up, the Song-su bridge collapse.

The Song-Soo Bridge over the Han River links two South Korean districts and is one of Seoul's most popular commuter routes.

But the 3,805 foot structure was struck by disaster on the morning of October 21, 1994.

The bridge struggled under the weight of the hundreds of people on their way to work in the early

morning rush, and at around 7.40 a.m., a 157 foot central chunk collapsed 655 feet into the

river below, along with cars, minibuses, and a fully loaded bus.

32 people lost their lives, while 17 more were injured, and an investigation was launched

into the freak accident.

The bridge had already received complaints about unstable foundations, which caused an unsteady swinging sensation,

and the root cause was identified as a construction failure. Reports noted that the steel

trestle joints supporting the central suspension had been welded with an incorrect thickness of

8mm rather than 10 millimeters, causing crucial

connecting pins to break under the immense pressure.

Although the bridge was designed to withstand a maximum 36.3 ton weight per car, vehicles

weighing 47.3 tons were also using the bridge to commute.

These combined factors cost the state council $185,000 in compensation to the victims,

while a complete rebuild set them back the equivalent of an extra 2 million.

Next, we have a London skyscraper that ended up resembling a supervillain weapon.

...