"This collectible weapon is the most devastating type found in the Wasteland. Launch using V.A.T.S. for pinpoint accuracy. This heavy, single-projectile weapon causes massive exploding radiation upon contact. If firing manually, point the launcher upward slightly to avoid a too-short and deadly launch. Usually found in poor conditions, use only on Behemoths or larger clusters of enemies."
Fun fact: this was actually a two story window prior to Morgan Freeman sitting on the windowsill. Once the house realized who he was, it retracted itself into the ground to prevent injury to Morgan Freeman.