on accident

.. or "that big a problem" and not "that big of a problem". Why the spurious 'of'?

But, do we want to get into this?

• start-up vs startup vs start up, shut-down vs shutdown vs shut down - one's a deverbal noun, ones an adjective, one's a phrasal verb. You will be judged by your usage.
• impacts vs impact ; if some guy was Rittenhousing in your area, the impacts would be small (5.56mm) but the impact would be massive. Compare supports (trusses) with support (mental assistance for those coping with a Rittenhousing)
• email vs emails ; because 'mails' (like 'cattles' or 'deers') was never correct if you passed elementary school and you look like an idiot.
• incase, aswell ; no millennial left behind.

The examples of people "removing all doubt" (Maurice Switzer) are everywhere.