Here's why:
* Situational Irony: The character's response ("great") is the opposite of what one would expect after being splashed with mud. The situation is unexpected and humorous.
* Verbal Irony: The character is using the word "great" sarcastically, implying that the situation is anything but great.
It's important to note that without more context from the story, it's impossible to definitively say which specific type of irony is used. However, the core concept of irony is present in the character's reaction.