Lol i thought it was retarded barney said that... what he REALLY should have said is:
"You left this at black mesa, well its not really the crowbar you used, but I just wanted to make a reference back to the "good 'ol days", a part of which i was never really involved. "
It just seemed really cheesy to me... like barney followed gordon around black mesa and picked up everything he happed to drop anal-retentavily.