And.. close to two years later (haven't been in this forum for a very long time!)
Another C/X moment:
Early S3 when Buffy's not back for the summer, and they all have nicknames during their slaying trips. Cordelia using the walkie-talkie and calling Xander "NightHawk" or something along those lines.
"NightHawk, can you hear me? NightHawk, come in."