- When a player looks at then puts his hole cards back down really quick, it's a strong hand.
In my experience it's usually the opposite: if they stare at their hole cards like a deer in headlights for longer than they normally would, it's usually the sign of a monster. The thought process goes something along the lines of
"Ohmygawd, I've got pocket kings, ohmygawd, awesome, what am I gonna do?".
Some players do exhibit the tell you mention though - they'll look at their cards, drop them like they're hot, think for a minute then make a bet. The tell here is usually they'll look back at them again, like they really can't believe they've been dealt pocket kings.
It really depends on the player, so I wouldn't rely on this one alone.
Some other simple ones:
- The way players stack their chips is usually indicative of their playing style. If they maintain sloppy stacks of odd denominations, they're probably a LAG. If they maintain neat stacks of 10 or 20 chips each, they're probably a TAG. If they've bothered to line up the flash colours on the side of their chips into neat lines or pretty patterns, they're probably a rock (hell - they've had time to make said pretty patterns in their chips, so they're obviously not throwing them around much)
- If there's a flush draw on the board and a player looks back at their cards, they probably
don't have the flush. If they had two spades, they would've remembered. They might have had a black card though, and they couldn't remember which suit it was. So they're probably still drawing, at best.