Anyone who's pulled targets in military matches has seen bullets turn around in the sand bank butts and come back. Most of the energy is dissipated, though. I've fired 30-06 armor piercing and had the steel penetrator core come buzzing back overhead.
10 Ducati 1098 Streetfighter S - "Sleipnir"
09 Kaw Versys
67 Triumph Bonneville TT Special
"The problem with Socialism is that you eventually run out of other people's money" _____ Margaret Thatcher