derailment
脱線
Nonsense
non sequitur (logic) and Non sequitur (literary device)
Red herring
Relevance logic
Schizophasia
SCIgen, a program that generates nonsense research papers by grammatically combining snippets; many of the sentences generated are individually plausible
Tip-of-the-tongue
train of thought
/suto3/google.iconderailment
image derailment
define derailment
wikipedia derailment
weblio derailment
kotobank derailment
jisho derailment