[j-a-a-p]

You might think, welding a ship together: what could possibly go wrong?

The first ships that were welded would suddenly break in two. These were the liberty ships used in WW2: https://en.wikipedia.org/wiki/Liberty_ship

[dredmorbius]

If you're ever looking for inspiration, consider that your own foul-ups could launch an entire new field:

These incidents are what led to the creation of the field of materials science.

(Wikipedia link above.)