When counting in English, it's not necessarily uncommon to just drop the 10s and just say the 1s digit until something more significant changes (e.g. thirty, one, two three...forty, one, two...fifty, and so on). However, one habit I've picked up over the years when counting is that I tend to do a similar cycle, but based on 20s instead of 10s. Can't say right offhand without some observer bias what I do at the end of each loop, but I believe I note the increments on the 20s (thus, 10, 20, 10 (30), 40, 10 (50), 60, and so on).
Does anyone else out there have similar quirks in their counting habits?