An actual MSN conversation with a co-worker:

[scumm_boy]

[16:08] Co-Worker: ack
[16:08] Co-Worker: ack
[16:08] Co-Worker: ack
[16:08] Co-Worker: ack
[16:08] Co-Worker: ack
[16:08] Co-Worker: ack
[16:08] Co-Worker: ack
[16:08] Co-Worker: ack ack ack
[16:08] Scumm_Boy: syn
[16:08] Co-Worker: ack
[16:08] Scumm_Boy: syn
[16:08] Co-Worker: lol
[16:08] Co-Worker: lmao
[16:08] Co-Worker: fin
[16:08] Co-Worker: rst

IP Handshake explination for those going "wha?"