Maybe taking somebody out for a meal or buying some really expensive black squid ink pasta?
For me, it is probably isn't all that high. I think it was about £120 for a meal with my girlfriend and that included wine.
I have a friend that will sometimes pay around £20 for a bottle of fancy olive oil.
Notes: I do consider £120 to be a lot of money. Please don't post stories about spending £100 during one pub crawl.