Alright, here's a short story of what happened just a few hours ago.
I was browsing the Internet when a Steam popup showed that somebody had added me. I proceded to accept this invite and learnt that this guy wanted to trade some items. After we're done trading, I asked him if he would favour checking out saloon.tf and betting. His answer was positive so then I briefly explained to him what teams are there to watch out for and directed him to the [R]eason vs TLR game. He said he was French so I told him about Nico and other great French players. Then the conversation ended.
After the game was over, he messages me saying that indeed the game was quite interesting. I was flabbergasted. I was glad his previous responses had been welcoming but I honestly did not expect that he would watch the match and that he would enjoy it. He even told me that he had bet some unwanted items on TLR and he was happy that he won! We then joked about Mike's armpit hair and some cool stuff that had happened during those two maps.
The fact that I intoduced a complete newbie to competitive and he even won some items in the process filled me with joy. Plus the fact that we had 1,000 viewers watching at one point.
TL;DR: A guy added me to trade, I showed him saloon.tf and the Reason vs TLR game, he liked it and even won some items by betting on TLR, it was a great feeling that he liked competitive
Now, what about you guys? Do you have any stories of introducing newbies to competitive?