Being a boulder
In the morning, the son crawls into his parents' bed, slips under the covers, and wedges himself between them. His movements are stiff, which is no wonder, since just the day before he was diagnosed with viral allergic arthritis in his right knee. Nevertheless, he isn't inclined to remain still for long, as neither early morning, nor viral allergic arthritis are really good enough reasons to put life on hold. After a day spent at the hospital, the parents would gladly put everything on hold, so the father simply pretends he is a boulder...