[excession]

Yeh - insta calls usually mean fairly weak hands - either draws or weak made hand like 2nd pair or weak ace on an ace high flop in a raised pot- if the turn misses it's often worth 2 barrelling.

Also a slight pause from a player can often indicate strength - just because people take more time to consider their options with strong holdings rather than marginal hands - you can use this when firing CB's - if I put in a slight pause before firing in a CB at just under a round number (like $9 into a $16 pot of whatever) - the more observant opponets start to smell a big hand a fold more often - the effect can be quite noticeable. Of course a longer delay can mean 101 things but a little pause before acting can be worth looking outfor.