Not Having a Common sense is
quote "DANGEROUS"
As there was once a soul who got reincarnated into a SLIMEand then immediately got carried away thinking his the main character as being PRIDEFUL will lead to your downfall as the man said:
"I got reincarnated? I must be the main character like one of those anime"
The fool looks around with it's fellow slime jumping around. he got too proud thinking his special:
"Those blobs seems to have no soul unlike me. Then I guess I'll have to seek out the world and become the strongest! *smile happily*"
As he jumps around the forest looking for treasures or item that will make him OP
humans found him
"Ow shoot! I must run quickly"
Would be the best thing that he would think but rather the slime choose to wave hi and say
"Hello I'm once a human "
~splak~
"Filthy slime"
The soul was immediately send back to his track to afterlife
Lesson of the STORY- Don't be reincarnated as a slime that's weak