Dear Rabbi Simon
What is your view of opening metal beverage cans (beer, soft drinks) on Shabbat?
I don’t do it, and we use only bottles of beer at Kesher, not cans, for this reason. However, there are posekim who allow this. Indeed, one can see beverage cans at some fine Shabbos tables. For those who are lenient: Best to empty the can into a cup promptly, rather than drink from it (which some consider a breach of derech eretz [etiquette] in any case).
Rabbi Rashi Simon