On irc.katipo.co.nz we have a #koha irc channel (have had since 2000). There have been literally thousands of times someone has been helped on there. Here are some of my favourites:

• Thd helps audrey with understanding MARC21
• si teaches kados about ssh-keychain
• I help kados out with html::template
• We help 2 people with Koha installs, and then discussion turns to cricket and rugby
• Lots of talk about cricket
• Even more talk about rugby

(I’ve only done the early years, and I leave it as an exercise for the reader to find other gems and link them in the comments)