If you really want to freak them out then wave the cash in the air first, asking loudly for a receipt.
I had to do this when I was shanghai'd by immigration as I had a new passport delivered to the D.R. with no entry stamp so they 'assumed' that I had been here over the 30 day threshold.
After Vacara's post on me being part of the corruption problem because I had previously paid the money to corrupt police to get out of extortion situations more quickly and conveniently, I had a rethink on this and do not play ball any more.
In that particular situation, where I needed to be on the flight, I had no choice so I made my protest by ensuring that the cash did not simply go into the back pocket of the corrupt official.
You should have seen the look on his face!!
And it got laugh from the other immigration guys.
If they had not changed the system on tourist cards then it would not have been an issue.
Why do they now sell you one then collect it 30 yards further down the line?
What is that all about?
Go England.....