Originally posted by KieranU2:Yep.
Boy Tour (9 times)
October Tour (11 times)
Elevation Tour (3 times)
Closed 23 shows in total.
EDIT: Should really be 24, since I never took Glastonbury into account.
26 according to U2gigs:
http://www.u2gigs.com/closingsong53.html
(it doesn't count Glastonbury either).
That makes OOC the 9th more common closing song, just after I Will Follow (30 shows, although probably more due to unkown setlists back in the 80s).
Nevertheless, I didn't know the exact figures but sure I knew it had happened before, and quite often... I can name some notable concerts closed with OOC, like the legendary 1980-02-26 Dublin show, 81-1-23 Belfast, 82-3-27 NY and the Turin and Arnhem Elevation shows.