On the commercial, of course, you see things like:
Tropical Fish & Grief Counseling
Private Investigator & Tango Lessons
Harry’s Movers & Marriage Counseling
How about these examples:
Bail Bonds & Blackjack Tables
Pet Grooming & Spot Welding
Computer Repair & Sushi Bar
Tattoo Parlor & Voice Training
Calligraphy & Bricklaying

Dopers, please post your own ideas for “paired” services.
How about a Vet Clinic & Taxidermy shop. Either way, you get your pet back.
Fine Jewelry & Septic Tank Cleaning
Schmidt et Cie. Ice Cream Parlor & Law Firm
Dance Studio/Discount Office Furniture Warehouse
A few more:
Wheel Alignment & Day Care Center
Urinalysis & hand-made sandwiches
Maid service & heavy-metal rock band agency
Lapidary & porno shop
Riding club & glue factory
Business law practice & jug band
Landscaping & travel agency