The bestest!

Somewhere, an English teacher is crying, and a kid is saying, why can't you say 'bestest'?

[and having formally studied linguistics, and having worked with non-native speakers for much of my life, I truly sympathize with how unruly English is.  It's one of the worst languages out there for 'rules, with exceptions'.  It's flexible in many ways, but it's also terribly difficult to learn.  'Bestest' actually follows the general rule in English better than 'Best'.  If you haven't taught English before, you don't know that when discussing such matters with a student, the eventual answer you must give is "that's just how it is".  Yeah, so it actually takes a Master's in English to learn that response??]

It should also be noted that non-native speakers are creating their own dialects of English in various parts of the world (e.g. India), and there's nothing to say that the Queen's English will win out in the end.  American English, for example, started as an upstart dialect in a colony in some mosquito infested part of the world that no proper gentleman would actually want to live.

Sidenote: around these parts, it's the Australian dialect that appears to predominate, which means I hear both "no worries" and "nice" a lot more than I'm used to.  And "mate", which is something that always gives me pause before I realize what they mean.