All these have happened and/or do happen to me:
When you hear an ASDIC ping without there being any microwaves or anything going. (Happened this morning, heard it as clear as a bell, made me flinch
No idea why, perhaps it was because of the pounding I took last night)
When you hum, whistle or sing Uboat songs, such as J'attrandei or my recent favourite, Das Uboot Lied.
When you hear a prop aircraft and want to hide and/or shout "Flugzeug gesehen!" (or something similar)
When you respond to people asking you to do something with "Ja wohl Herr Kaleun."
When you spot a ship, and mutter "Schiff gesehen!" under your breath, then start estimating tonnage, range, AOB.
