'I'm a landscape architect'
'Landscaping? Must be hard on the back!'
'Well, I'm mostly sat behind a desk.'
'You do the designs?'
'Yep.'
A slight pause. 'Do you know where I can get some high quality plastic plants?'

I suddenly choked on something.

'You alright mate?'
'Yeh good.' 
He tried again: 'So...know anywhere?'
'I'm afraid not.'
Another pause. 'Which ones should I get?'
'I'm sorry?'
'Which ones should I get?'
'Which plastic plants should you get?'
'Yeh.'
'Get the ones which only need watering once every two weeks.'
'Wha-'
'You know when you see a plant, and you go up to touch it to check that it's real or not? You want the ones which fool you twice.'
'Uh...not sure I follow.'
Didn't think he would.