According to Merriam-Webster, to be a liquid is to be capable of flowing freely, like water.
#1 Therefore, Cats Must Be Liquids. Look At Them
#2 Just… Look At Them
#3 They Fit Into Anything That Isn’t Cat-Shaped
#4 They Are Far Too Squishy To Be Solids
#5 This Cat Is Literally Dripping Off Someone’s Legs