March 18 in Pop Culture History March 18th is… Awkward Moments Day Biodiesel Day Forgive Mom and Dad Day Lacy Oatmeal Cookie Day Sloppy Joe Day Supreme Sacrifice Day 37 – Caligula was declared emperor of Rome. 1834 – The first US railroad tunnel was completed between Hollidaysburg and Johnstown, Pennsylvania. 1850 – Henry Wells …