Miller Lite recently introduced their new Punch Top Can last month... introducing a whole new way for
Below are three product demo-ads featuring the can design and it's function. Some may consider this another gimmicky product design and others may find the vent-hole a necessary detail to get their brew in their belly faster sans the suds...
The can is designed with a weak point near the tab that can be pushed open (with apparently anything from a set of keys to a pool cue—assuming that also includes a can opener) and act as a vent when pouring the can's contents down your gullet. This reduces fizzing and results in a smoother pour.