Yes, upon seeing this I immediately wanted a 'trick' cup that did this but had this, umm, feature more hidden by placing it in the side of the cup not the middl

Yes, upon seeing this I immediately wanted a 'trick' cup that did this but had this, umm, feature more hidden by placing it in the side of the cup not the middle. But then an unsuspecting, but non-greedy, user may spill the entire cup just by sipping out of the wrong side! The central column should make it quite safe in comparison.