My grandpa was in New Guinea during WW2, now I know that this isn't Eastern Front, but this is the only story i know first hand..
He and his buddy were scouting ahead of their unit, when suddenly they hear a column of Jap tanks and infantry approaching. They dive into a ditch beside the road and attempt not to make any sound or movement.. The column passes by them unaware of their presence. a Japanese soldier finishes his cigarette and right as he walks by he flicks the cigarette right on my grandpas shoulder..
That's all he told me, I'm not sure if he kept it somewhere but its too late to ask him now
He passed away on the night of December 7th-8th, 2003
Coincidence?