I've got to put myself in this thread. Well, vocabulary not grammar, but close enough. I arrived early for a hot date (weeding an allotment) so texted the allotment owner that I had "underestimated the time it would take to get here". I had, of course, overestimated it.

(I went on to compound the stupid by looking in the wrong shed. "The watering can's not in the shed." "Are you sure?" "Nothing there, see." "That's not our shed.")