I usually just say " odd, i cant seem to find that one"

They are being explored for clinical applications like treating depression.

In most places its not legal to serve yourself alcohol you brought to the restaurant yourself. So as a compromise many restraunt owners will allow you to bring a bottle of wine that they dont carry, and then charge you a fee to serve it to you. This means they are staying within the law with respect to liquor laws.

For example where I it is illegal to give away alcohol tor free. If a restaurant serves it to you, even if you purchased it before hand, they would be serving it for free and thus a violation of the liquor laws; hence the corkage fee which allows restaurants to so serve you your wine within the law.

https://www.touchbistro.com/blog/corkage-fee/

A few charged for opening a bottle of wine. It used to only be charged if you brought your own bottle to the restaurant.