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Cuckoamphibius (no. Just no.)

Get in the saddle. I promise you won't die as soon as your butt hits the leather.

Credits to Madisaurus for the Cuckos that are more menacing and less comical, but probably have (the slimmest of the slim) less ability to kill you within the time lapse of as soon as you touch it.

It pretends to be nice and friendly, and will get into a laying down position, like it wants you to ride it. As soon as you get in that saddle, it does not matter who or what you are, you die right then and there. No warning, nothing. It just absolutely tears you to shreds.