Throughout this period, Harrison's devotion to Hindu spirituality – particularly to Krishna consciousness via his friendship with A.C. Bhaktivedanta Swami Prabhupada – reached new heights. As Harrison admitted, his adherence to his spiritual path was not necessarily consistent. His wife, Pattie Boyd, and their friend Chris O'Dell would joke that it was hard to tell whether he was dipping into his ever-present Japa Yoga prayer bag or "the coke bag". This duality has been noted by Harrison biographers Simon Leng and Alan Clayson: on one hand, Harrison earned himself the nickname "His Lectureship" during his prolonged periods of fervid devotion; on the other, he participated in bawdy London sessions for the likes of Bobby Keys' eponymous solo album and what Leng terms Harry Nilsson's "thoroughly nasty" "You're Breakin' My Heart", both recorded in the first half of 1972. Similarly, Harrison's passion for high-performance cars saw him lose his driving licence for the second time in a year after crashing his Mercedes into a roundabout at 90 miles an hour, on 28 February, with Boyd in the passenger seat.