Didn't eat the head though...
The bill for the meal with 2 pepsi's came to a whopping 176.364 rials!
Which equals EUR 4,21.... after some initial confusion about the banknotes I gave the guy 200.000

This way I'll be bringing back most of my money...!

Edit: which clearly he has refused 'cause he's given me back 310.000 from 500.000.....

Edit 2: after a recount he gave me 301.000 change. What was the point of that?