Hypothesis: a programming language having a mascot is a warning sign.
- Perl 6: Camelia the butterfly (and Perl 5 had camels)
- PHP: the elePHPant
- (I don't think Python actually has a snake *mascot*, just a logo.)
- Java: Duke, the...whatever, that Sun licensed out in an almost pleading appeal for fanart (https://web.archive.org/web/20070618073343/https://duke.dev.java.net/)
- Go: the Gopher which eats all your descriptive variable names