Ok, some are obvious, some are not. Plz add in your own,
A few of these are just leak spots, but, or course, fish have alot of leaks, so its at least "intersting" infomation
1. All-in in a nothing pot, pre or post flop.
2. Never folds a small blind....ever!
3. Plays way to many hands.
4. calls raises with crappy hands like a-9 or k-9, espeically OOP
5. if they ever say "your a Mag, (minus the M plus an F)" or "you suck" for no reason in chat. (people with only 6th grade level insults that come out firing for no reason are easily tilted by clever insults back, btw) plus, "your a [censored]" actually translates into, "there a small brained twit poker player"
6. Draw chasers with crappy potodds
7. People that have no clue that the time meter online is actually a BIG clue to a good player. (ex. 1,2, big overbet =bluff everytime! yummy! samlon!)
8. Loss a big pot, Then super AGG the next hand. ( i actually "fake" this one whenever i make a goodhand after losing a big pot against a good player)
9. (sometimes) when people don't autopost. usually more bad players then good do this. (good players know time is money)
10. People with really immature disgusting names. If someone names themselves something that an 11 year old would find hillarious, they probably think like one.

I can think of a few more, but 10 is a catchier subject name. Plz add any that i missed.