yeah, sometimes i do that, now that you mention it...i don't know why, but i do it....i have the tv on one channel, then i put it on another and start watching, then turn to the last channel, just to see where (on what channel exactly) it was....
very rarely do i do the second thing you mentioned.....for example, after hearing something bad, or seeing something "ugly" on tv, i have to let it pass, or wait until something ok or "nice" comes up before i turn it off....i guess it's not exactly like your issue, but similar....
weird, huh?