What are some Japanese contractions?

What are some Japanese contractions? I'm talking about the less mainstream ones, not like desu = de gozaimasu, or da = dearu

I mean stuff like this
なくちゃ＝なきゃ
です＝っす
～ています／etc＝～てます／etc
～ておきます／etc＝～ときます／etc
～てしまいます／etc＝～ちゃいます／etc
～でしまいます／etc＝～じゃいます／etc

>>2
As a lasy, yet fluent Japanese speaker, I add that this is a very good list, but I will contribute nothing to it.