Miscalculated?

In one part of Danganronpa 2, a character called Nagito plants some bombs, and the rest of the characters have to defuse them. But then the bombs don't go off when the characters expect them to. So one of the characters says "Maybe Nagito miscalculated something". Then Joe said that it would be funny if we heard Nagito say "Miscalculated? Oh no!" from another room, which he said in his impression of Nagito.