I saw today at Pinnacle the over/under parlay line for Raptors/Warriors game was at 22.5 (should have been 222). At first I thought I should take it, but then I tried to stay within reality and accept the fact, that they will simply cancel my bet sooner or later. So I emailed them to notify about the mistake. 5 minutes later the line was corrected. 10 minutes later they gave me a $20 credit
And that's not too bad for me, because I only wager $5 per bet.
PS. I know there was a similar thread from a few days ago about how someone notified a book about an obvious line error, but I searched for it and couldn't find it.

PS. I know there was a similar thread from a few days ago about how someone notified a book about an obvious line error, but I searched for it and couldn't find it.