P1000 Ratte
The Landkreuzer P. 1000 “Ratte” (English: Land Cruiser P. 1000 “Rat”) was a (possibly fanciful) design for a 1000-ton tank for use by Nazi Germany during World War II, that may have been proposed by Krupp director Edward Grotte in June 1942, who had already named it “Landkreuzer”.
Credit to : The Iron Armenian aka G.I. Haigs