Birthmark
A father and a son both have the same big birthmark on their butt. Believing that the two birthmarks are connected, the son scrubs his father's birthmark to remove it—but he just can't get rid of it.
2021
2011
2013
1976
1965
1981
1978
1973
1982
1989
1970
1972
2023
2022
2014
1991
1977
1968
2017