Shout-out to shoopfex for letting me use his Eureka 7 acapella. His mashups are some of the best this community has to offer:
Also, thanks jonsp2000 for introducing me to the Sgt. Frog song. Check him out for more awesome mashups:
Mashup using:
Home Made Kazoku - Shounen Heart (A Cappella) [Eureka Seven OP2]
Masayoshi Ooishi - Kimi Ja Nakya Dame Mitai (A Cappella) [Gekkan Shoujo Nozaki-kun OP]
Dance Man - Afro Gunso [Sgt. Frog / K