We used to have a mouse like that, no matter what traps we put out the bugger would just eat the food on it and then leave. On one notable occasion we even made a home made trap, took a big 2 litre coke bottle, cut off the top and put something on it similar to the Crown (that new speedfeed for reloader Bs), easy to fall through, impossible to push through from the other side, and the mouse managed to get into the bottle, eat the peanut butter in the bottom then climb up a foot of plastic before getting out of the bottle. Similar to j@mes, the mouse only stopped when it was caught by one of our pets.