Evil Pops !
[5] pops with line of sight to a drain:
1981, Gottlieb Black Hole (5* of 6) http://www.ipdb.org/machine.cgi?id=307
[4] pops with line of sight to a drain:
1979, Bally Future Spa (4 of 5) http://www.ipdb.org/machine.cgi?id=974
1981, Gottlieb Volcano (4 of 4) http://www.ipdb.org/machine.cgi?id=2742
1981, Bally Medusa (4 of 4) http://www.ipdb.org/machine.cgi?id=1565
[3] pops with line of sight to a drain:
1978, Bally Nitro Ground Shaker (3 of 3) http://www.ipdb.org/machine.cgi?id=1682
1978, Bally Paragon (3 of 4) http://www.ipdb.org/machine.cgi?id=1755
1979, Bally Kiss (3 of 4) http://www.ipdb.org/machine.cgi?id=1329
1979, Williams Time Warp (3 of 5) http://www.ipdb.org/machine.cgi?id=2568
1980, Stern Big Game (3 of 3) http://www.ipdb.org/machine.cgi?id=249
1980, Stern Ali (3 of 3) http://www.ipdb.org/machine.cgi?id=43
1981, Gottlieb Alien Star (3 of 3) http://www.ipdb.org/machine.cgi?id=49
1983, Gottlieb Amazon Hunt (3 of 3) http://www.ipdb.org/machine.cgi?id=49942
[2] pops with line of sight to a drain:
1979, Game Plan Sharpshooter (2 of 4) http://www.ipdb.org/machine.cgi?id=2113
1979, Bally Viking (2 of 4) http://www.ipdb.org/machine.cgi?2737
1980, Bally Flash Gordon (2 of 2) http://www.ipdb.org/machine.cgi?id=874
1980, Stern Galaxy (2 of 3) http://www.ipdb.org/machine.cgi?id=980
1980, Bally Eight Ball Deluxe (2 of 3) http://www.ipdb.org/machine.cgi?id=3154
1980, Stern Star Gazer (2 of 3) http://www.ipdb.org/machine.cgi?id=3149
1980, Gottlieb Time Line (2 of 2) http://www.ipdb.org/machine.cgi?id=2564
1981, Bally Embryon (2 of 4) http://www.ipdb.org/machine.cgi?gid=783
1981, Bally Fathom (2 of 3) http://www.ipdb.org/machine.cgi?id=829
1982, Williams Defender (2 of 2) http://www.ipdb.org/machine.cgi?id=651
[1] pop with line of sight to a drain:
1979, Williams Gorgar (1 of 3) http://www.ipdb.org/machine.cgi?id=1062
1979, Stern Meteor (1 of 1) http://www.ipdb.org/machine.cgi?id=1580
1982, Gottlieb Haunted House (1 of 3) http://www.ipdb.org/machine.cgi?id=1133
1984, Williams Space Shuttle (1 of 3) http://www.ipdb.org/machine.cgi?id=2260
1985, Game Plan Cyclopes (1 of 3) http://www.ipdb.org/machine.cgi?id=619
DMDs with [1] pop with line of sight to a drain (just one calorie of evil):
1993, Williams Whitewater (1 of 3) http://www.ipdb.org/machine.cgi?id=2768
1993, Midway Twilight Zone (1 of 3) http://www.ipdb.org/machine.cgi?id=2684
1997, Bally Circus Voltaire (1 of 2) http://www.ipdb.org/machine.cgi?id=4059
2012, JJP, Wizard of Oz (1 of 3) http://www.ipdb.org/machine.cgi?id=5800
* While Black Hole has (5 of 6) dangerous pops, please be advised that only 3 are in play at once on the upper playfield. This effectively means that the "evil per square foot" is BELOW that of Volcano and Future Spa. So roughly speaking, Black hole belongs in the [3] group.