The Medway Handyman wrote:

One old boy came up with a 'solution'. Put several elbows in the waste
pipe, to take it down to floor level, under the unit, back up the other side
& reconnect to the waste - effectively forming a huge 'U' in the waste pipe.

I tried to explain that it wouldn't work, the huge 'U' would always be full
of water & the sink wouldn't empty properly.

He was adamant that it would work. I'm start to doubt my own sanity here.

Surely it wouldn't work?

A U-bend is a U-bend. All you have here is a ginormous U-bend.

That is not to say that a ginormous U-bend is going to be in the slightest bit
desirable.

-- JJ