Total Recommendations: 5
those two have many, many mindfuck-moments, it isn't really an anime who can watch anyone (some could even barf)
both have similar styles, stupid characters, and the jokes are simply "under the belt"
both are very funny schoolmangas
both are sportsmanga, very funny and the characters are just too creepy
both are very dramatic, and have a "drilled in the head of somebody"-setting, and the chara-development is interesting but there are 2 big differnce: 1. heads is a love-story 2. in homunculus, the guy get a "sixth sense" after the operation, in heads he gets a "second personality"