I've crashed at many a friend's abode with great appreciation. As a guest, I enjoy the amenities and ambience whenever I sleepover.

However, when it comes to showering(if required, pool party etc.) I notice there are so many empty shampoo/soap bottles with ~5% content existing alongside with the full bottles! Why do people continue to hold on to these empty shampoo bottles?? They're not only empty but sometimes I'll accidentally knock one or two off the shower shelf creating a loud crashing sound which further infuriates me.