It&#x27;s as much a cultural thing as it is a generational thing. In Argentina, where I grew up, showing up unannounced to a friend&#x27;s house is normal (some people might add: &quot;as long as you bring some food!&quot;); on the other hand, in neighboring Brazil it was seen as a pretty rude.<p>So, I guess, what might not work for you might work for other people. I personally prefer at least a couple hours of heads up, but don&#x27;t mind doing a last-minute dinner&#x2F;lunch when I&#x27;m close to a friend I haven&#x27;t seen in a while.