As clear as mud

Very difficult to understand:

His instructions were as clear as mud.

Cambridge Dictionary

1 Horrible Car Crash Prank

27 jul. 2011

Good Samaritans are asked to help out signalling to drivers around a car that crashed in a terrible accident. Soon, a police officer shows up to ask what the hell they are doing… and to the victims surprise, the upside down car and the portable toilet have completely disappeared!
 
A presentation of JustForLaughsTV, the official Just For Laughs Gags YouTube channel. Home of the funniest, greatest, most amazing, most hilarious, win filled, comedy galore, hidden camera pranks in the world!
 

2 Sasquatch caught on camera!

16 mrt. 2011

At the site of an accident people get a glimpse of the elusive Bigfoot, the Sasquatch, the brown Yeti… or just a man in a brown suit!
 
A presentation of JustForLaughsTV, the official Just For Laughs Gags YouTube channel. Home of the funniest, greatest, most amazing, most hilarious, win filled, comedy galore, hidden camera pranks in the world!
 

3 Car falling on its side prank!

16 mrt. 2011

 
A girl with a flat tire stops drivers on the side of the road, asking for some help but when they try jacking it up, the car continues being jacked until it is completely on its side.
 
A presentation of JustForLaughsTV, the official Just For Laughs Gags YouTube channel. Home of the funniest, greatest, most amazing, most hilarious, win filled, comedy galore, hidden camera pranks in the world!
 

Not at all easy to understand.

More example sentences

‘what the statement really means is still as clear as mud’
‘As I suspected, all is clear as mud at this point.’
‘The next steps are clear as mud.’
‘The strangely murky waters of the UK’s broadband market were stirred up once again last week, making things clear as mud, as usual.’
‘It was just clear as mud to me, and I was hoping you could help me with it later on.’
‘On the flip side, some parts of the plot that aren’t explained still seem to be vital to the story, so several chapters are clear as mud.’

Oxford Dictionary