It HAD to come, didn't it? Not only were members of the Wehrmacht inordinately fond of silly photographs, but the habit was also rife among RAD members. This group are using a variety of props, whilst managing to keep all their clothes on . . .
Luftwaffe soldier playing his accordion while a comrade acts in a most unbecoming manner - World War II
I suppose it was the accordion . . . very occasionally, I have read, it has this effect on some people. However, I see the accordionist is wearing winter-weather boots, so they must have been on the Russian Front - it might have been a ruse to fright…