Lids and caps you can't open without pressing down first. My joints are sore and it hurts! Also those mayonnaise caps you have to undo then pierce, then do up again. And, those daft aspirin tops you have to line up the steps before they will open. So handy in the middle of the night! I suppose it's to stop children from opening things, but we never needed such protection when young, we had more sense, and our parents kept dodgy stuff out of our reach.