Photo: 747-8 vs Tow

http://www.flightglobal.com/articles/2010/06/08/342910/pictures-further-details-emerge-following-747-8f-tug-collision.html
Further details have emerged after one of Boeing's 747-8F flight test
aircraft struck an airport tug causing significant damage to the
exterior of the number four General Electric GEnx-2B engine.
The result of the impact was a 88.9 x 43.2cm (35 x 17in) hole on the
aircraft's inlet cowl then "tapering into a dent 12.7cm (5in) in
length on either side of the hole".