[checkdigit15]

> To the point where you wish you hadn't started but the sunk cost of time invested is such that there is no way back either.

"All causes shall give way. I am in code

Stepped in so far that, should I wade no more,

Returning were as tedious as go o'er."

[jacquesm]

Anecdote: fix the root cause of some really hard to get to bug only to realize you forgot what the highest level problem was.

[tonyarkles]

Are you me? :D