This is a bit old, but maybe some of you have not seen it. It's a simple game where you kick someone down the stairs for high scores based on damage done.
http://jet.ro/dismount/ is the website. They also have "Truck Dismount" which is similar except the person is on a truck that you run into a brick wall.
Available for Windows, Mac, and Linux.

Missing the good times in SRO... 
SRO:
1x, STR Blader (Thebes)
54, STR blader (Venice)
0x, INT wizard (Venice)
19, INT spear (Venice)
34, STR rogue/bard (Venus)
0x, STR blader (Venus)
8x, INT bard/cleric (Gaia)