Their attempt to fix the sink was a total thud and blunder.
thud and blunder
idiomAn adventure or active endeavor that is characterized by, often humorous, errors.
Origin
disputed originSpoonerism of blood and thunder.
The team's plan to organize the event became a thud and blunder when they forgot to book the venue.
What began as a serious expedition to map the remote valley quickly devolved into a thud and blunder of missed turns and broken equipment.