On the far left edge of T J Swan Cliff, just above the shimmering expanse of T J Lake, lies a sport climb that demands attention—Mamma Gonna Slap You Twice So You Don't Forget. This concise, 35-foot route grabs your focus immediately with its steep, textured start. The initial moves challenge your balance and power, negotiating broken rock that tests your precision and commitment. As you ascend past six or seven well-spaced bolts, the terrain eases into a slabby arete, offering delicate footwork and a satisfying finale that rewards your effort with a pulse-quickening sense of mastery. The wall faces eastward, so you'll catch morning warmth but benefit from afternoon shade, making early starts ideal during warmer months.

Located in the scenic Mammoth Lakes Area on California’s Sierra Eastside, this climb situates you within a rugged landscape defined by crystalline high desert air and crisp mountain views. The approach is straightforward—a brief walk from established parking near T J Lake—allowing you to conserve energy for the climb itself. As you stand beneath the route, the rock’s coarse texture promises solid friction on the slab, while the nearby alpine lake whispers reminders of the serene natural world surrounding this focused bout of vertical movement.

Though modest in length, the route’s 5.10a rating is no small feat; it demands precise technique, especially on the slab where trusting your feet outpaces brute strength. Protection feels reliable with 6 to 7 draws clipped into solid bolts, making it an accessible sport route with just enough bite to engage intermediate climbers hunting for a short but concentrated challenge. With an average star rating of 2.5 from a handful of votes, it’s clear that the climb holds niche appeal—ideal for those seeking a quick test or a warm-up on a day exploring the wider Mammoth Lakes climbing landscape.

Essentials for success here include sticky-soled shoes for delicate edging, a light rack of quickdraws, and a helmet to guard against occasional loose rock from above. The climb's approach is direct but always wise to keep an eye on sudden weather shifts common to the Sierra peaks. Summer and early fall offer the best conditions, with stable temperatures and longer daylight hours to savor the climb and the sweeping views that stretch out to the horizon.

After topping out, a short walk off and mild scrambling bring you back to basecamp, leaving you time and energy to explore other nearby lines or simply soak in the alpine setting. Mamma Gonna Slap You Twice So You Don't Forget stands as a sharp, focused pitch—brief yet potent, technical but approachable, framed by one of California’s most breathtaking outdoor classrooms.