A large metal pot lid hit with car keys. Recorded with a contact mic into a Zoom H4N.
An E7(dominant)chord, played on guitar.
Low/floor tom drum recorded with a cardioid condenser microphone
a pipe being hit with a hammer, with the end submerged in an aquarium. the pipe was too close, so ...
Nagra ARES BB+ & 2 Schoeps CMC 5U 2011 A small chinese cymbal hit with hand, very close.