The Aperture Science High Energy Pellet can and has caused permanent disabilities such as vaporization. Please be careful.
Edit: How do you change death picture things? I want to change the one you have with the pic of the guy getting hit with a ball thing for my own needs :P
I made a custom death CI for the ball, added it as a damage type, then made a special case for the Pong Ball damaging players where it kills AI/Players who have the Portal Player type. The picture is located in Add-Ons/Player_Portal.zip/CI_pong.png. (also attached)
AddDamageType("Pong", '<bitmap:add-ons/player_portal/CI_pong> %1', '%2 <bitmap:add-ons/Player_Portal/CI_pong> %1',0.2,1);
%1 is the player who died and %2 is the player who killed you. The path to the picture must be absolute. (can't use ./CI_pong, etc.)