"Praise kek" is an example:
https://archive.4plebs.org/pol/search/text/%22praise%20kek%22/order/asc/page/3/
"You just know" is another:
https://archive.4plebs.org/_/search/subject/%22you%20just%20know%22/order/asc/
Another thing I've noticed is there is a certain set of meme phrases on 4chan that I never see on altchans, like "You just know..."
This leads me to believe each of those phrases is just one obnoxious Hikikomori who has the time to spam his phrases on 4chan, but doesn't use altchans.