Recent findings have shown that bizarre imagery can be an effective mnemonic aid when lengthy retention intervals are employed, and when the surrounding context contains more normal elements. Testing the hypothesis that an interaction exists between context and time of testing with bizarre images, a study paired 40 male and female undergraduates, presenting them with three lists (normal, bizarre, and mixed) arranged in a randomized order. The sentences within each list consisted of stimulus-response pairs of high-imagery nouns. Each subject pair was told to form an interactive mental image of the two nouns within a restricted period. Then, one subject participated in an immediate cued recall condition for each list while the other was tested after a 1-week retention interval. As predicted, a list by test interaction was found in which items from the mixed list were recalled best under delayed recall. Results suggest that bizarre images enhance memory over time, especially when common materials provide a contrasting surround. (A table of sentences presented in the normal, bizarre, and mixed lists, and a table of the mean number of response terms recalled as a function of list and type of recall are included, and nine references are appended.) (Author/MM)