Impulse tattoos are a bad idea—you know, they’re permanent, and all. But if you have to have a lotus blossom or a lightning bolt right this minute, there are many talented and responsible walk-in shops. You may not get the artistry and pedigree of the people above, but you’ll get a decent, clean tat by trained professionals (who will generally turn you away if it seems your determination is tequila-fueled). In Manhattan, go to Fineline (21 First Ave., nr. 1st St.; 212-673-5154) or Rising Dragon Tattoos (230 W. 23rd St., nr. Seventh Ave.; 212-255-8288). In Brooklyn, go to Designs by Michael Angelo (6217 Sixteenth Ave., nr. 62nd St., Bensonhurst; 718-331-1411) or Vinny’s Tattoo and Body Piercing (1669 Sheepshead Bay Rd., nr. Voorhies Ave., second fl., Sheepshead Bay; 718-368-0438).