When you throw a stielhandgranate at a tank and it hits it's armor, there's effect similar to one when tank shell hits armour (I mean there is loud "bump" sound, sparks, some smoke sometimes, I hope you know what I mean :) )
Tested also mills bomb, it's free of this effect.
Vehicles that I used for testing: sherman, Pz3N, Marder
The stielhandgranate generally makes a surprisingly big impact when landing somewhere. A lot of dirt thrown in the air etc.
That's strange. I've found that on local server. Few minutes ago I asked my friend to set up a server, so we I can check it once again. German grenades were bouncing of tanks without any "special effects" and I couldn't reproduce the bug. Probably one more to throw into X-Files:BF2...
I've seen it on El Ala with the German tanks, where it sparks when hitting it, never payed attention on other maps.
Oddly, I get that same bug, only it happens when I throw stick nades and it lands on the ground o_O
This has been around before 2.15 though, so it isn't a 2.15 bug...
It has always appeared in local games since before the first release, but I have just seen it when someone threw a stick grenade at a bofors gun.
It doesn't matter if it happens in a local game because apparently things can behave differently in a local game and not affect online play. I don't know why that is.
I will do some testing online to see if this is now indeed a bug and not just an extremely rare occurrence.