I needed to pellet a saline solution containing cheek cells for genomic DNA isolation but I did not have a centrifuge that could hold 50mL tubes. The solution was to tie the centrifuge tube to my ceiling fan with shoestring. The ceiling fan centrifuge was ghetto, scary-looking, and effective (it had 3 different speed settings!). I made a video, check it out below.
Before using the fan I first tried to spin the shoelace (with tube) by hand – but this did not work out at all as the solution kept getting stirred.