A no limit play - the blocker bet

[Van_Broke]

I see players (mostly donks), getting check raised on the flop and then throwing out some ridiculously low bet on the turn hoping for just a call . Basically a weak attempt at a blocker bet, but it seems like it might be usefull at times. I really don't use it much, if at all, and am thinking it might be something I should consider in some situations. Do you guys ever use it? If so, in what situations? Bet size relative to pot?