Wharr I do?
![video image](https://i.ytimg.com/vi/tSIQtk3lZt0/default.jpg)
The speaker in this video is replacing a string of two alveolar stops /t/ and /d/ divided by an unstressed vowel /ɪ/ with an alveolar trill [r]. This is a very interesting example of how new, ostensibly difficult to pronounce sounds can be introduced to a language.